KEISOKU GIKEN Co., Ltd.
Essential tool for periodic inspection ofequipment power supplies

Digital Ripple & Noise Meter
RM-104

SimpleOne touch!
No reading error!

Easy andnntemerusaemeer
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Digital Ripple & Noise Meter

RM-104● Automatic measurement possible which is correlated
tooscilloscope reading.
● Easy one-touch measurement by digital technology!
● Automatic “PASS” or “FAIL” judgment!
● Compliant with JEITA* measurement standards.
JEITA: Japan Electronics and Information TechnologyIndustries Association

It is mandatory to conduct periodic maintenance of the power supplies in industrial equipment used in
power plant or other public services.
As power supply is the key devise in the system and their system will shut off when power supply failed
and will cause serious damage to our life. Normally ripple voltage and noise voltage of the power supply
are measured in the periodic check but those are not that straightforward.

RM-104 measures 5 types of voltage easily!
The output of switching power supply contains various kinds of waveforms and are all combined. WithRM-104, 5 different voltages can be measured easily.

Diagram of Ripple & Noise waveformABDCE

A: Ripple & noise voltage B: Ripple voltage C: Noise voltage
D: Switching ripple voltage E: AC ripple voltage

Since the measuring object is “NOISE” , reading waveforms on the oscilloscope is very complicated andgood experience is needed. However digital ripple & noise meter can discriminate them and read themaccurately.

*It is possible to judge if the capacitance of the electrolytic capacitor used inside of the switching power supply is in allowable range or not bymeasuring
D (Switching ripple) or B (Ripple) above.

Up to now……

From now on…
It is difficult toread ripple voltage
from complex
waveforms...

Oscilloscope isbulky and not thatuser friendly too…

Do by whoever,
it is the same!

One touch simple measurement

We need easy way…
The next calibration
year and month are also
displayed at startup!

Noise? Ripple?

Switching power supply
Oscilloscope

Switching power supply

Differential probe
DP-100
Ripple & Noise Meter
LAN-compatible forRM-104
d ata c o ll e c t i o n atremote locations!

Measurement by oscilloscope

Measurement by RM-104

The reading result is heavily relying to the operator.

No reading error due to digital display

Panel operation is not simple

One touch simple measurement

Need additional differential probes to measure

Passive type differential probe as a standard accessory

Specification
1.DC Volt. Measurement
Range
Resolution±6.0000 V
0.1 mV-6.0000 V ～ 6.0000 V

Measurement TimeMeasurement Time±60.000 V
1.0 mV-60.000 V ～ -5.600 V
5.600 V ～ 60.000 V±0.025 % of rdg. ±0.025 % of f.s.
±500 V
less than 90ms(Fast Mode) / less than250ms(Slow Mode)±500.00 V
10.0 mV-500.00 V ～ -56.00 V
56.00 V ～ 500.00 V

Accuracy*5
Max. Applied Volt.
Measurement Time *4
2.Ripple & Noise Measurement
Ranges300.0 mVp-p
3000 mVp-p
Resolution
0.1 mV
1.0 mV
Accuracy*1,*2, *5±2 % of rdg. ±1 % of f.s.
THRU
50 Hz ～ 100 MHz
L.F filter
50 Hz ～ 2 kHzFilter
H.F filter
2 kHz ～ 100 MHz
20 MHz bandwidth limitation
50 Hz ～ 20 MHz
Ripple Ratio*3
0.0 % ～ 50.0 % (0.5 % increment)
Measurement Time*3,*4Approx. 170 ms
3.Interface
GP-IB
Compliant with IEEE488.1
LAN *6IEEE 802.3
USB
USB2.0 compliant (Full-Speed)
OUT PORT: PASS,FAIL
Photocoupler output 24V common (14-pin connector) *8
OUT PORT: start trigger
Photo-coupler input 12V common (14-pin connector) *7
OUT PORT: 4 CH output
Photo-coupler output 24V (for SC-83 control) *8
4.Input terminals, cables
Impedance
DC 1 MΩ, high frequency 50 ΩCable
DP-100 or 50 Ω coaxial cable, 1.5 m
5.General
Power supply
AC85 ～ 264V, 50/60Hz（47 ～ 63）
Power consumption
30VA or lessDimensions *9180(W) x 85(H) x 300(D)mm
WeightApprox. 1.8kg
Withstand voltage
Input to output 3000V AC for 1 minute / Input to FG 1500V AC for 1 minuteInsulation resistance
Between input and FG DC500V 30MΩ min.
Operating temperature/humidity range
0℃～ 40℃ 20% ～ 85%RH or less（No condensation）
Storage temperature/humidity range-20℃～ 60℃ 20% ～ 85%RH or less（No condensation）
advanced
Less than 2000m*1 : Effective when Ripple Ratio is setup between 0% and 10%.*2 : Effective when Frequency Range is between 10kHz and 10MHz.*3 : Operates when
Frequency Range is between 10kHz and 100MHz.*4：Measurement Time in the same Measurement Range.*5：Guaranteed for 6 months when
Operational Temp. is 23+-5degree C and Humidity is less than 70degree C.*6 :Factory option.*7 :Photocoupler input Input rating: 12V 12mA (input resistance 1KΩ) *8 :Photocoupler output
Output rating: 24V 10mA MAX *9 :External dimensions do not include interface protrusions.
・The calibration year and month are displayed on the screen at startup.・Compatible with previous model RM-103.

DP-100A Differential probe( One is attached to RM-104 main unit as standard)
The DP-100A reduces common mode noise drastically then measures the signal between two measurement points accurately.
No power to the probe is required.
Maximum input voltage
Frequency bandwidth
Characteristic Impedance
Input capacitanceCommon mode rejection ratio
Attention ratio± 200V DC or AC p-p
DC ～ 100MHz50Ω（1MHz or higher）
0.01μF（When RM-104 is connected）
40dB（100MHz）
1:1

TRC-50F2 High Frequency Termination Resistor
When measuring Ripple & noise with an oscilloscope, using this 50 ohm terminator (50 ohm resistor and DC cut capacitorinclusive) is recommended for accurate measurement because it can resuce Noise Reflection due to impedance unbalance. TheTRC-50F2 conforms JEITA specification.
digital oscilloscopeDiﬀerential probeDP-100A

TRC-50F2Max. Input Voltage
Frequency bandwidth
Characteristic Impedance
Allowable continuous power
Connector
Dimensions※DC ± 500V
1MHz ～ 100MHz50 Ω（high-frequency termination）
0.25W
BNC
17 φ× 54 (L) mm

The RM-104 has a built-in circuit equivalent to the TRC-50F2.

The content of this catalog is generated based on the latest data as of April. 2023. / Please consult us for the latest specification, price and availability of the product prior toordering. / All brand names, product names and company name are registered trademarks of their respective companies. / Information in this document is subject to change
without notice.

KEISOKU GIKEN Co., Ltd.

AgentsPowerElectronics Sales Dept.

Hiyoshi Operation

4-11-1 Minamikase, Saiwai-ku, Kawasaki-shi,
Kanagawa, Japan
TEL +81-44-223-7950 FAX +81-44-223-7960

E-mail : PWsales@hq.keisoku.co.jp / https://www.keisoku.co.jp

Issued April 2023 ●CP-0040-2304