Recommended Test Equipment; Resistor Connections; Resistor Considerations - Keithley 2302 Instruction Manual

13-4 Performance Verification

Recommended test equipment

Table 13-1
equipment as long as that equipment has specifications at least four times better than
corresponding Model 2306 specifications. Keep in mind, however, that test equipment accuracy
will add to the uncertainty of each measurement.
Table 13-1
Recommended verification equipment
Description
Digital Multimeter
Precision Resistor
Precision Resistor
Precision Resistor
1
Full-range, 90-day, 23°C various measurement points.
2
Characterize resistor using 4-wire ohms function of DMM before use.
3
Required only for Models 2306-PJ and 2302-PJ. Characterize resistor using 4-wire ohms function and 200OHM
range of DMM before use. See Resistor considerations for temperature coefficient.

Resistor connections

When performing the verification tests that use the precision resistors, be sure to connect the
Model 2306 OUTPUT #1 or OUTPUT #2 SENSE leads and DMM test leads as close to the
resistor body as possible.

Resistor considerations

The test resistors should be characterized using the lowest possible range and the 4-wire ohms
function of the DMM recommended in
measured resistance values to calculate the actual currents during the test procedures.
NOTE
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
summarizes recommended verification equipment. You can use alternate
Manufacturer/Model
Keithley 2001
The temperature coefficient and temperature change of the 1Ω resistor when passing
current at full load must be low enough so that the change in resistance does not cause
incorrect readings. This is summarized in the following equation:
V
OUT
<
25% of Model 2306 amps specification
--------------------- -
( Δ )
R R
+
where: V is the Model 2306 output voltage
OUT
R is the characterized value of the resistor
ΔR is the change in resistance caused by heating
Specifications
1
DC Voltage
1
Resistance
1Ω, 0.1%, 100W
30Ω, 0.1%, 50W
3kΩ, 0.1%, 0.25W
Table 13-1 to measure the resistance values. Use the
20V: ±22ppm
20Ω: ±59ppm
200Ω: ±43ppm
20kΩ: ±36ppm
2
3
2