RACK MOUNT TYPE
8 CHANNEL V-F CONVERTER( TYPE: VF8-02 )USER'S MANUAL
4076 (Rev1/2020.01.22)

APPLICATION OF ELECTRONIC DEVICESTSUJI ELECTRONICS CO.,LTD3739 Kandatsu-machi Tsuchiura-city
Ibaraki-Pre 300-0013 Japan
Phone +81-(0)29-832-3031
Fax +81-(0)29-832-2662
URL https://www.tsuji-denshi.co.jp/
E-mail info2@tsuji-denshi.co.jp

RACK MOUNT TYPE
８ CHANNEL V-F CONVERTER USER'S MANUAL( TYPE: VF8-02 )VF8-02 accepts AC220V power suuply.
VF8-02 is constructed in a EIA 2 unit rack mount case.
VF8-02 has eight channels outputs include a four stage amplification factor switch
and a polarity selector switch.
In addition, with over range and polarity displayed, V-F conversion is always performed atthe optimum conditions.
1. Specification
1) Gain
2) Input Voltage
3) Inpur Resistance4) Output5) Output Frequency
6) Conversion Accuracy7) Scale Over8) Input / Case Isolation
9) Analog Monitor Output
10) Input / Output Connctor
11) Power Supply
12) Case::::::::::::

10V, 1V, 100mV, 10mV0 ~ 10V (Acceptable input ±100V Max)
1MΩ or more
TTL level, Positive Logic, Pulse Width 150ns or more
0 ~ 1MHz< ±0.02%FS
Open collctor transistor = ON (Insulation)
Select either Isolation or GND
Monitor analog value before V-F conversion
Isolated BNC
AC220VEIA 2 unit W482xD430xH88mm

2. Front Panel / Rear Panel(1) (2) (3) (4)

(11)

(5)

VF8-02 type(6) (7)

(8)

(10)

(9)

(12)

(13)

Front Panel(1) Scale over LED lamp (RED)
LED lights on if the input level exceeds conversion level.
If Scale over LED lights on, the conversion is not done correctly.
(2) Polarity (+) LED lamp (GREEN)
The polarity of the analog signal that is before V-F conversion is (+).
And VF conversion is done correctly.
(3) Polarity (-) LED lamp (RED)
If its LED lights on, the polarity of the analog signal before the VF conversion is negative.
And for correct conversion, the signal polarity must be changed by input polarity selection.
(4) Input range select SW
Select SW in response to the analog value of the input signal.
Input rage
Analog input signal
10V:
0 ~10V
1V:
0 ~
1V100mV:
0 ~ 100mV
10mV:
0 ~ 10mV
Analog signal can be converted by VF polarity switching of (5), even if input polarity is (-).
(5) Select input polarity
Input polarity (Normal or Reverse) must be selected by the polarity of input signal
as follow.
When VF conversion is not working by incorrect input polarity, LED (RED) is lighted on.
Analog input signal
Input polarity selection
0~10V:
NORMAL0~-10V:
REVERSE(6) Input BNC connector
Input analog signal of V-F conversion.
Input will be isolated from case GND, if the FLOATING is selected in the switch (10).
(7) Output BNC connector
Output is TTL positive pulse.
The output has been isolated from the internal circuit because there is photocoupler.
(8) Analog monitor BNC connector
Analog value before VF conversion has been output through the buffer.
GND level is the same as analog input (6).
Rear Panel(9) Scale over output BNC connector
Transistor (open collector) tuens on, if scale over.
Output is isolated.
(10) Floating / Non Floating (G.COMMON) select SW

Selected the below.
Floating: Isolates the input signal's GND and case.
Non Floating : Unites the input signal's GND and case.

Power(11) Power SW

Power On/Off switch.
LED lights on at power on.
(12) Fuse

There is 3A fuse inside of it.

(13) AC input connector

Inlet type of 3PAC connector.
Must connect AC220V (Line, Neutral, and earth ground).
3. Block Diagram of Input / Output Stage
Analog Input

INPUT-100kΩ+///

1MΩ///

Pulse Output+5V330ΩOUTPUT

JP222Ω///50Ω
TTL
L.PWR///
100Ω
Scale Over Output

Analog Monitor Output

INPUT100Ω+///