MR8740T_user_manual_eng_20191016H.pdf - 第83页

78 Conguring Generator-Module-Specic Settings Comprehensive test The instrument outputs the following voltages and currents of each output function and each generation range, measuring them with the internal measuremen…

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77
Conguring Generator-Module-Specic Settings
Switching OUTPUT terminals
Terminal setting Internal circuit
Open
Output
circuit
OUTPUT
GND
Short
Output
circuit
OUTPUT
GND
Normal
Output
circuit
OUTPUT
GND
IMPORTANT
Do not set the OUTPUT terminal status to [Short] when a power supply device connects with the
OUTPUT terminal. A short-circuit current will ow, resulting in damage to the instrument or power
supply device.
Self-diagnosis function
Simple test
At the time when you send a query for testing, the instrument measures an output value of the
instrument with the internal measuring circuit and return the specied value and a measured value.
For the voltage output setting, the instrument sends back the specied voltage and a measured
voltage value.
For the current output setting, the instrument sends back the specied current and a measured
current value.
3
Advanced Functions
78
Conguring Generator-Module-Specic Settings
Comprehensive test
The instrument outputs the following voltages and currents of each output function and each
generation range, measuring them with the internal measurement circuit. Then, the instrument
sends back measured values of each output value.
Output item
Generation
range
Measurement
range
Output testing
point
Voltage
5 V 0.5 V 0 V
0.5 V
5 V 0 V
5 V
Current
5 mA 5 mA 5 mA
1.1 mA
1 mA 1 mA 1 mA
275 µA
250 µA 250 µA 250 µA
55 µA
50 µA 50 µA 50 µA
0 µA
CAUTION
Do not connect anything with the OUTPUT terminal during comprehensive tests. The
instrument outputs a zero-volt signal and connects the OUTPUT terminal with the GND
terminal (in the short-circuit state) during comprehensive tests. If a power supply device
connects with the instrument, a short-circuit current will ow, resulting in damage to the
instrument or power supply device. The comprehensive test results may be affected
depending on devices connected.
Offset canceling function
Regulating the zero point of the output circuit
The instrument measures an output circuit offset with the internal measurement circuit and outputs
a value the offset value is subtracted from.
CAUTION
Do not connect anything with the OUTPUT terminal during an offset measurement. The
instrument outputs a zero-volt signal and connects the OUTPUT terminal with the GND
terminal (in the short-circuit state) during the offset measurement. If a power supply
device connects with the instrument, a short-circuit current will ow, resulting in damage
to the instrument or power supply device. The results (zero-point regulation) may be
affected depending on devices connected.
79
Conguring Generator-Module-Specic Settings
To perform precise measurement
IMPORTANT
Be careful of the following points when the instrument outputs a current of 100 µA or less with
the current output function, when it generates a resistance of 50 k
Ω
or more with the resistance
generation function, or when a device connected with the instrument has an output resistance of
50 k
Ω
.
• We recommend you to use measurement cables with an insulating sheath made of
polyethylene (PE) or polytetrauoroethylene (TFE). Using measurement cables with a low-
resistance insulating sheath will increase leak currents, with the result that accuracy is
signicantly affected.
• The instrument will become susceptible to exogenous noise. We recommend you to use
shielded measurement cables or connect a capacitor between the OUTPUT terminal and GND
terminal.
3
Advanced Functions