User's Manual
MS3739
Slim Plug-In Ratio/Bias Converter with Isolated Single/Dual Output
Rev. 1.60
3
Specifications
5. External Dimensions & Terminal Assignments
Screw hole for
wall mounting
Screw hole for wall mounting
Fixing screw
6. Terminal Connection Diagram
Terminal
No.
Note: For the single output model, the OUTPUT2 shown should be
interpreted as N.C.
7. Terminal Connection
The following steps should be taken prior to the connection.
8. Power Line Connection
The terminals for power supply connection (
①
and
②
) are covered
with a plastic plate for safety (see Fig. 1).
Open the cover plate and connect the power lines to the terminals
(see Fig. 2).
Return the cover plate to its original position (see Fig. 3).
4
5
1
2
P/+
N/-
4
5
4
5
Terminal Block
Cover
Note: For your safety, do not make any electrical connections or
disconnections with power supplied to the instrument. Make
sure that all terminal screws are properly tightened each time
you finish the tightening.
Input Resistance
Voltage input:
1M
Ω
min. with or without power.
Current input:
4 to 20mA DC: 250
Ω
(standard)
2 to 10mA DC: 250
Ω
1 to 5mA DC: 100
Ω
0 to 20mA DC: 250
Ω
10 to 50mA DC: 10
Ω
Allowable Input
Voltage
Voltage input: 30V DC max., continuous.
(Standard for a span up to 10V)
Current input: 40mA DC max., continuous.
(Standard for 4 to 20mA)
Allowable Output
Load
Voltage output:
1V span and up: 2mA max.
10mV: 10k
Ω
min.
100mV: 100k
Ω
min.
Current output:
Single current output:
750
Ω
max. (for 4-20mA output)
Dual current output:
Output 1: 550
Ω
max. (for 4-20mA output)
Output 2: 350
Ω
max. (for 4-20mA output)
Zero Adjustment
Approx. ±5% of span.
(Adjustable by the front-accessible trimmer.)
Span Adjustment
Approx. ±5% of span.
(Adjustable by the front-accessible trimmer.)
Ratio Setting
Range
Positive gain: 0.1 to 4.00 (in 0.01 steps)
Negative gain: -0.1 to -4.00 (in 0.01 steps)
Bias Setting
Range
-100 to 100% (in 1% steps)
Output Range
Approx. -10 to +120% (1-5V DC)
Accuracy Rating
Better than ±0.2% of span (at 25°C±5°C)
Ratio = 1; Bias = 0% (positive gain)
Ratio = -1; Bias = 0% (negative gain)
Temperature
Effect
Better than ±0.15% of span per 10°C change
in ambient.
Response Time
85ms max. (0-90%) with a step input at 100%.
Insulation
Resistance
100M
Ω
min. (@ 500V DC) between input,
output 1, output 2, power, and ground.
Dielectric
Strength
Input / [Output 1, Output 2] / [Power, Ground]:
2000V AC for 1 minute (Cutoff current: 0.5mA)
Power / Ground: 2000V AC for 1 minute
(Cutoff current: 5mA)
Output 1 / Output 2: 500V AC for 1 minute
(Cutoff current: 0.5mA)
Surge Withstand
Capability
Tested as per ANSI/IEEE C37.90.1-1989.
Storage
Temperature
-10 to 60°C
(1) Loosen the terminal screw.
(2) Insert the tip of a
screwdriver bit beneath
the washer and push it
up to make ample room
to receive a cable.
Fig. 1
Fig. 2
Fig. 3