MR8740T_Quick guide_eng_20191016H.pdf - 第147页
141 Specications of the Options Self-diagnosis Operation comprehensive test The instrument outputs the following signals with the voltage and current functions, measuring them using the internal measurement circuit. If …
140
Specications of the Options
Measurement
accuracy
DC
voltage
5 V range ±0.030 % of rdg. ± 700 µV
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
5 V range
(for resistance
output function
only)
±0.030 % of rdg. ± 100 µV
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
DC
current
5 mA range ±0.040 % of rdg. ± 900 nA
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
1 mA range ±0.040 % of rdg. ± 180 nA
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
250 µA range ±0.040 % of rdg. ± 45 nA
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
50 µA range ±0.040 % of rdg. ± 10 nA
Temperature
coefcient
Add the following value when operating the
instrument in temperature ranges of 0°C to 18°C
and of 28°C to 40°C
[0.05 × (measurement accuracy)] /°C
Effect of radiated
radio-frequency
electromagnetic eld
1% f.s. (Max.) at 3 V/m (for DC voltage output function)
Effect of conducted
radio-frequency
electromagnetic eld
1% f.s. (Max.) at 3 V (for DC voltage output function)
No accuracy is specied for AC voltage output and AC current measurement.
141
Specications of the Options
Self-diagnosis
Operation
comprehensive
test
The instrument outputs the following signals with the
voltage and current functions, measuring them using the
internal measurement circuit.
If a measured value differs from the corresponding output
setting value by more than the threshold value, the
instrument gives itself a fail judgment.
The instrument returns a judgment result, output setting
value, and measured value in response to a query.
The threshold value of 0% causes the instrument to fail to
judge.
Voltage function 0 V, .0.5 V, 5 V
Current function 0 µA, 50 µA, 55 µA, 250 µA,
275 µA, 1 mA, 1.1 mA, 5 mA
Threshold
value
Setting
range
0% to 10%
Setting resolution: 1%
Default
setting
0%
Simple test Using the internal measurement circuit, the instrument
measures an signal outputted when a command is sent.
The instrument returns an output setting value and
measured value in response to a query.
Switching OUTPUT
terminals
Relay switching time
Operation
OPEN:
SHORT:
NORMAL:
Opens the circuit of the OUTPUT terminal.
Connects the OUTPUT terminal to ground. (10
Ω
or less with a
load current of 5 mA)
Outputs the specied signal across the OUTPUT terminal.
Default
setting
OPEN
Connected-object
presumption
Operation With the resistance generation function, the instrument presumes an output
resistance value of the connected object, capacitance value between the
OUTPUT and GND terminals, and voltage value across them.
Optimizes a resistance-generation response coefcient based on the
presumption.
When the time constant based on an output resistance value and inter-
terminal capacitance value is less than 10 ms, the inter-capacitance is
determined to be 0 pF.
Calculation
time
1.6 seconds (max.)
Offset cancel
Operation
Measures an output-circuit offset with the measurement circuit and outputs
a signal with the offset subtracted.
Default
setting
Off
5
Specications
142
Specications of the Options
Specications of output connector
Connector used: 25 pins, female, locking-block screws #4-40
Connector pin-out
Pin Signal name Pin Signal name
1 NC 14 CH8_GND
2 CH8_RESERVE 15 CH8_OUTPUT
3 CH7_GND 16 CH7_RESERVE
4 CH7_OUTPUT 17 CH6_GND
5 CH6_RESERVE 18 CH6_OUTPUT
6 CH5_GND 19 CH5_RESERVE
7 CH5_OUTPUT 20 CH4_GND
8 CH4_RESERVE 21 CH4_OUTPUT
9 CH3_GND 22 CH3_RESERVE
10 CH3_OUTPUT 23 CH2_GND
11 CH2_RESERVE 24 CH2_OUTPUT
12 CH1_GND 25 CH1_RESERVE
13 CH1_OUTPUT