Digital Strain Indicator
ＴＤ−３５
Operation Manual

Teac Corporation
Ver

2006/ 4/18

P/N D009185‑00C

1PrefaceThank you for purchasing a TD‑35 Digital Strain Indicator.

Read this manual and understand the contents correctly before using the productfor the best performance of the TD‑35.

Warranty
This is a product that has passed a strict in‑house quality inspection. We will
repair or exchange it upon any failure or trouble of this product according tothe service standard prescribed by TEAC Corporation. This TEAC warrantee shallalso fully comply with any local product liability law.

Teac Corporation
Headquarter Sales Department:
3‑7‑3, Nakacho Musashino‑shi, Tokyo 180‑8550 Japan

TEL: (0422) 52‑5082

Contacts for Technical Support
Business Solutions Company

Sales Department

TEL

E‑mail：tic̲cs@tic.teac.co.jp

Hours(0422) 52‑5074

Sales 1 Group

Mon〜Fri (except Holidays) AM 9:30〜12:00、PM 1:00〜5:00

TEAC Corporation Web Page

http://www.tic.teac.co.jp/2Index
1. Overview...................................................................................... 4
2. Features ...................................................................................... 4
3. Configuration .............................................................................. 4
4. Standard Accessories .................................................................. 6
5. Specifications .............................................................................. 6
6. Operation..................................................................................... 8
7. Measuring Method.................................................................... 12
8. Miscellaneous Materials........................................................... 15
9. External View ........................................................................... 183

1. Overview
The TD‑35 is a digital strain indicator that suits various strain gauge basesensors, used for the indication of pressure, load or torque as well as theload‑cell. This offers the display resolution of ±20000×10‑6 strain. In
addition to the display in strain unit, it is also capable of converting the value
into a real unit such as in Newton (N) using the preset sensor‑output‑value (mV/V)
for direct reading convenience. This operates with a built‑in battery (AAA type)or external AC power supply (using an AC adaptor).

2. Features
1) Small and compact size.
2) All necessary functions for the static strain indicator are equipped andready to make a measurement simply by connecting the sensor.
3) Suited for almost all types of strain gauge base sensors such as load andpressure.

3. Configuration
1) Pre‑amp

6) Bridge power supply

2) A/D converter7) Operation controller

3) Display circuit

8) Internal battery4) Ref. power circuit

9) AC adapter5) CPU

10) Power circuit

454. Standard Accessories
1) ZR6(Y) Oxyride dry‑cell battery ・・・・・・・・・・・・・・・・ Qty 42) Operation Manual ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ Qty 13) AC Adapter ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ Qty 1

5. SpecificationsInput: Strain gauge type connector

Input connector: NDI‑7R connector

Bridge power supply: Approx. DC 2.5V, Max current 30mA

Input range: ±20000×10−６ strain（±10mV/V）

Zero shift: ±10000×10−６ strain, digital adjustment

Display: Strain display mode : 0 ±20000×10−６ strain
User display mode : 0 20000×10−６ strain value
can be converted to an arbitrary user value
within 0 99999 (with arbitrary decimal point)

Display module: LCD, Character height approx. 12mm,Display frequency: Approx. 6 times/second

Peak hold: Maximum value during measurement

Calibration accuracy: 0.1％ F.S or less (FS = 20000×10−６ strain)

Linearity: ±1×10−６ strain ＋1digit

Stability Zero

: ±0.2×10−６ strain/℃

Stability Sensitivity: ±0.1×10−６ strain/℃

Low battery voltage warning : LCD showsB

under approx. 4V

Operating condition
Temperature range: 0〜45℃

Humidity range: Max. 80% RH (without condensation)

Storage temperature range: ‑40〜80℃

Power supply (Internal): ZR6(Y9) dry battery(Externnal): DC5〜8V AC adapter(Current consumption) : Approx. 170mA/DC6V (when sensor=120Ω,Back‑light=OFF)

Battery life: Approx. 8 hours (when ZR6(Y) Oxiride dry‑cellbattery, sensor=120Ω, Back‑light=OFF, atroom temperature)6

Dimension: 150mm(W)x100mm(D)x40mm(H) (excluding umbo)

Weight: Approx. 500g (including ZR6(Y) dry‑cell battery)76. Operation
6.1 Functions and controls in rear panel①

DC IN ‑ External Power Input Connector
The power input connector when AC power is used.
Use the supplied accessory AC adapter for the external power.

②

POWER ‑ Power Switch
The power switch for the internal battery or the external power.
When the external power is connected, the internal battery is used and notconsumed.

③

LIGHT ‐

Back‑light Switch for LCD

The ON/OFF switch for the display back‑light.

Note that twice as much power

is consumed when it is turned on in battery operation.
④

INDICATION ‐Display Unit Switch

The switch to select whether the strain input is displayed in strain unit
(STRAIN) or the mV/V input is displayed in user defined unit (USER).

When STRAIN is selected, it displays in strain quantity (x10−６ strain),
and when USER is selected, it displays in user defined quantity.
⑤ZERO ‐

Zero Cancel ON/OFF Switch

The ON/OFF switch of the zero cancel operation.
When it is ON, the zero cancellation is performed by pressing and holding ⑬"SELECT" on the operation panel and press ⑨↓"ZERO‑RESET".
8

When it is OFF, the zero cancel operation is not performed and it displays
the strain quantity with reference to the TD‑35 internal zero in the selecteddisplay mode set in ④. This can be used to check the initial balance valueof the strain gauge or strain gauge sensor.
⑥INPUT ‐Sensor Input Connector

The NDIS standard input connector for the strain gauge sensor. Applicable plugmodel is PRC03‑12A10‑7M10.5 made by Tajimi‑Musen.
PinSignal (Cable Color)Ａ

Bridge Voltage ＋ (Red)Ｂ

Bridge Output

Ｃ

Bridge Voltage −(Blue)Ｄ

Bridge Output＋(White)

Ｅ

Shield(Yellow)

Ｆ

No Connection

ＧNo Connection− (Black)(Color in parentheses is of our company
Strain gauge sensor connecting diagram

9s color)

6.2 Operating Function and Controls⑦↑ KeyUsed to increase the setting value⑧→ KeyUsed to move the digit during setting value⑨↓ Key (ZERO‑RESET)
Used to decrement the setting value or zero cancellation when used together
with ⑬ key.

⑩

← Key
Used to move the digit while setting value⑪ENTER Key
Used to set the value in various settings⑫

PEAK HOLD Key
Used to select the peak hold operation
It holds and displays the maximum value of the A/D sampling data. During
the peak hold operation, [P] is displayed in the LCD. When [P] is displayed,press this key again and [P] disappears indicating that the peak hold modeis canceled, the display mode returns to normal.
10⑬SELECT Key
Used to combine with other keys for various operations

Key Operation

Operation⑬SELECT Key ＋⑨↓Key

Zero cancel⑬SELECT Key ＋⑪ENTER Key

USER unit display⑬SELECT Key ＋⑧→KeySet values or decimal point in

⑩

←Key

USER unit display mode

6.3 Internal Battery and Replacement
The AAA type Oxiride dry‑cell battery is recommended but any other AAA typebattery may be used. However the operating time will vary depending upon thebattery used. The operating time of approx. 8 hours described in thespecification is under the conditions of a ZR6(Y) Oxiride dry‑cell battery
used at room temperature. When the voltage drops below 4V, [B] is displayedon the LCD. When it occurs replace the battery or switch to the external powersource soon. When replacing the battery or switching to the external power,
turn off the POWER switch ② in the rear panel. (Note that it does not
automatically switch to the external AC power source in battery operation)
Battery Storage
It is installed in the area where the lid in the rear panel slides.
Rear View

MODEL NO.ＴＤ−３５

DIGITAL STRAIN INDICATOR
5‑12V 0.3‑0.14A
SERIALNO.

TEAC INSTRUMENTS CORP

MADE IN JAPAN→Battery Storage

11Slides to this direction

7. Measuring Method
7.1 Notes in Measurement■ TD‑35 is a strain measuring instrument primarily for the static strain (DC〜about 3Hz).
The A/D sampling frequency of TD‑35 is 6Hz. For the strain measurement of ahigher frequency component, use the dynamic strain measuring instrument
instead.
■ Because the signal from the strain gauge or sensor is minute, pay special
attention to noise intrusion.
For the signal cable from the sensor, use the dedicated 4‑wire shielded cable.
■ Use it where the signal cable does not touch or run parallel to the power line.
Also keep the signal cable away from any strong magnetic field generating
devices such as a motor or a power transformer.
■ During operation, avoid direct sunlight, high temperature, high humidity, orplaces where dew condensation may occur such as rapid temperature or humidity
changes.

7.2 Wire Connection
This is a strain indicator for measuring the strain gauge type sensor gauge output
such as a load‑cell. For the strain measurement of an individual strain gauge,
use the BX‑100 strain gauge bridge box with the 1‑gauge or the 2‑gauge method.

7.3 Measurement
7.3.1

Strain Measurement

Connect a sensor to ⑥ INPUT in the rear panel, switch ④ INDICATION to STRAIN,and ⑤ ZERO SET to OFF, then turn on the power. It is now ready in strain displaymode.
■ Zero Adjustment
Switch ⑤ ZERO SET in the rear panel to ON, press ⑨ (↓Key) ZERO RESET while
holding ⑬ SELECT button in the operation panel, and the display changes tozero and it is now ready for zero adjustment. The range of zero adjustment
is ±10000×10−６ strain.
When it exceeds the range, the LCD displays [OFF OVER] and you will not beable to return to the previous display for the zero adjustment.
When you wish to make a zero adjustment, set it to within ±10000×10−６
12strain by referencing the material in the back of this manual, then make azero adjustment.
■ Peak Hold Display
Press ⑫ PEAK HOLD button and the display shows [P] then the peak holdoperation starts. It continues until ⑫ PEAK HOLD button is pressed again.
7.3.2

User Unit Display Measurement

Connect ⑥ INPUT in the rear panel to a sensor, switch ④ INDICATION to USER,and the display mode becomes a user display mode. The displayed value is computed
according to the user defined physical quantity (Kg, etc.) vs. sensor
sensitivity (mV/V) setting.
■ Sensor Sensitivity (mV/V and rated capacity) setting procedure
Press ⑪ ENTER while holding ⑬ SELECT in the operation panel, and thedisplay changes to C 00.000. Move to a desired digit using ⑧(→) or ⑩(←)
key, and select values using ⑦(↑) or ⑨(↓) key. Once a desired value isset, press ⑪ ENTER. Then the rated capacity is displayed as G 00000. Moveto a desired digit using ⑧(→) or ⑩(←) key, and select values using ⑦(↑) or ⑨(↓) key.

(The rated capacity is a value found in the sensorsdata sheet)
To change the decimal point position, move the cursor to a desired decimalpoint position using ⑧ (→) or ⑩ (←) key, press ⑪ ENTER key, and thecharacter display becomes reversed. Move to a desired position using ⑧(→)
or ⑩(←) key, and press ⑪ ENTER. When all of the settings are finished,press ⑪ ENTER one more time.
■ How to set the number of digits below decimal point in the measurement screen
The number of display digits below decimal point can be selected during
measurement. Press ⑧(→）or ⑩(←) key while holding ⑬ SELECT, and thecharacter at the cursor becomes inverted. Move to a desired digit using ⑧(→) or ⑩(←) key, then press ⑪ENTER. Note that the maximum value to be
displayed is 9999 including the number after the decimal point.
■ Zero adjustment and peak hold display
The operation and function are the same as strain measurement. Switch ⑤ ZEROSET in the rear panel to "ON". The zero adjustment is engaged by pressing⑨(↓key) ZERO RESET while holding ⑬ SELECT button. The adjustable range
is ±10000×10−６ in strain quantity.
■ Display accuracy

The numerical value that is smaller than 1×10 −６ strain in13inputstrain quantity converted value

can be displayed by moving the decimal

point. However, not all digits in display are guaranteed due to thestability or accuracy, etc.
■ Initial Setting
Turn ② POWER on while holding both ⑬ SELECT button and ⑦ ↑ keysimultaneously, and keep holding both keys until the measurement valueappears. The unit is then initialized to the user unit of 1.000ｍV/V and thedisplayed value of 2000.

7.4 Alarm Display
Alarm during measurement■ OVER
Description：Displayed value exceeds the limit of 9999
Countermeasure：If in user unit mode, adjust the maximum digits or thecoefficient so that the expected maximum measurement value fits in 9999.
■ OFF OVER

Description：Input value exceeds the offset adjustable range.
Countermeasure：Refer to Zero Adjustment in the back of the material andadjust the bridge balance to the level smaller than ±10000×10−６ strain.
■ AD +OVER/‑OVER

Description：The input level from sensor exceeds ±20000×10−６ strain.
Countermeasure：Open wire or disconnection of sensor or sensor cable isconsidered. Make a correction.

Power on error message
The following alarm indicates errors from EEPROM rewrite times (10７ times),
data storage life (10 years), setting, internal process. PRM ERR is an error
during setting and the others do not occur during normal operation. In caseof an error, turn off the power then turn it back on. If the error continues,contact our sales department or distributor.
1. RECOVER：Invalid user unit coefficient. (Unit reboots as result)Power has been disturbed during data saving to ROM.

2. PRM ERR：Invalid conversion coefficient
One or both terms in sensitivity (mV/V) are zero. (Enter avalid value)14

3. AD ERR：Communication with internal A/D failed. (Reboot the unit)

4. CAL ERR：Invalid written data in ROM.

5. ROM WERR：ROM write failure.

6. ROM RERR

：ROM read failure.

7. ROM EERR

：ROM erase failure.

8. SYS ERR：Internal process error.

9. BAD CALD

：Calibration failure due to the abnormal ROM data.

8. Miscellaneous Materials
ZERO adjustment of strain gauge sensor
The sensor generates a slight voltage even if no load is applied.
When there is a tare weight such as a weight measuring device, the voltage equivalent
to the tare weight is generated. The zero adjustment range of TD‑35 is ±5mV/V (±10000×10−６ strain). In case it does not meet the zero adjustment within this range,
as shown in the figure below, the zero point shift resister that corresponds to thesensor output can be externally connected so that the zero point is shiftedelectrically.
RZ is connected to only one side depending on the direction of the sensor. The directionof zero shift changes depending on the connection either between ‑SIG(B) and +EXC(A)or ‑SIG(B) and ‑EXC(C). The RZ is to be connected between ‑SIG and +EXC(B‑A) when theimbalance needs to be canceled such as in subtracting tare weight of measuring weightdevices (tare weight appears as positive in sensor output).

15

The resister to be used (RZ) directly influences the zero drift characteristic of thesensor, therefore use the resister that has an excellent temperature coefficient.
(25ppm/℃ or less recommended) This method can be used for sensitivity calibration
when the indicator is replaced.
In general, the initial calibration is done by combining with a sensor and an actual
applied load. However, when a re‑calibration is not feasible, it can be done with thefollowing substitution method without using an actual load.
After initial calibration, connect an appropriate resister (RZ) to one side of thebridge and record the displayed value, then remove the resister. When the indicator
is replaced for a reason of servicing or so forth, connect the same resister used above,adjust ZERO balance, and make a sensitivity adjustment so that the reading value becomes
the same as the previously recorded value.
The table in next page shows the resister values and the shift amount when a resister
is connected to one side of the bridge circuits having two different resister values,
350Ω and 120Ω. These resister values are calculated amounts and they may be off due
to the errors in the input and the output resistance of the sensor. Use these values
only as an estimate or guideline.

16Added resister value versus input conversion strain of the bridge circuit with 350
Ω and 120Ω resistance.

List of switch settings on measurement items

17

１００１１

9. External View

４０１５０

MODEL NO.ＴＤ−３５

DIGITAL STRAIN INDICATOR
5‑12V 0.3‑0.14A
SERIALNO.

18

TEAC INSTRUMENTS CORP

MADE IN JAPAN１.６