Keithley 2303, Service Manual, Page: 22 / 104

Performance Verification 1-11
2. Select the multimeter DC volts measuring function, and enable auto-range.
3. Select the 5mA readback range and actual current reading data.
4. Turn on the Model 2303 output.
5. Verify 5mA range current readback accuracy for the currents listed in Table 1-6. For each
test point:
• Set the Model 2303 output current to the correct value, as determined from the digital
multimeter voltage reading and 3k
Ω
resistance value. Note that it may not be possible
to set the output current to the exact value. In that case, set the current to the closest
possible value, and modify reading limits accordingly.
• Allow the reading to settle.
• Verify that the actual Model 2303 current reading is within the limits given in the table.
Table 1-6
Model 2303 and 2303B 5mA range current readback accuracy limits
* As determined from digital multimeter voltage reading and 3k
Ω
resistance
value. See procedure.
Model 2303-PJ 500mA range readback accuracy
The following tests apply only to the Model 2303-PJ:
1. With the power off, connect the digital multimeter and characterized 30
Ω
resistor to the
Model 2303-PJ OUTPUT SOURCE terminals, as shown in Figure 1-5. Be sure to
observe proper polarity and connections (30
Ω
resistor between and DMM
INPUT HI; SOURCE - to DMM INPUT LO).
Nominal output
Voltage Model 2303
output current* Current readback limits
(1 Year, 18°C-28°C)
3V 1.0000mA 0.9970 to 1.0030mA
6V 2.0000mA 1.9950 to 2.0050mA
9V 3.0000mA 2.9930 to 3.0070mA
12V 4.0000mA 3.9910 to 4.0090mA
14.7V 4.9000mA 4.8892 to 4.9108mA
深圳德标仪器
135-1095-0799