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5560A/5550A/5540A
Service Manual
Frequency Calibration Adjustment (OUTPUT VZ)
The frequency calibration adjustment requires a frequency counter - see Table
recommended model/requirements.
1. When the Product displays a connect prompt, connect the frequency counter Input A to the Product
OUTPUT VZ HI/LO with the BNC cables and adapters
2. Set the frequency counter as follows: Frequency Input A, Gate time of 1s, Trigger on positive slope,
AC Coupled, 1 M Ω Input Impedance, Amplitude 3 V.
3. When prompted, set to OPERATE.
4. Measure with the frequency counter and input the counter measured value with the touch display
interface.
5. Continue with all steps for this function as in step 3 and 4.
6. When a section is complete, the Product highlights the following section.
Amps DC Calibration Adjustment
The Product begins the adjustment with internal steps. Once these internal steps complete, the
Product prompts the connection of the VI Aux terminals to a current DMM. This procedure is a
simplified method that does not produce the greatest TUR (Test Uncertainty Ratio). Advanced
calibration laboratories can use modified methods to improve TUR. Alternatively, you can use the
meter with shunts as in the calibration verification section. To proceed with the meter in amps dc mode.
To use the high-accuracy mode (shunts with a meter), you must determine and connect the shunt
model for each step. Failure to connect the appropriate shunt may result in shunt damage.
1. Set the 8588A as follows: Amps dc, Range Auto, NPLC 50, Guard ON (external guard).
2. When the Product displays a connect prompt, connect the 8588A for Idc measurement with a
heavy gauge low thermal cable. Tap Continue after the connection is made.
3. When the Product displays an instruction to set the Product to Operate, push OPERATE.
4. Measure with the meter and input the value on the touch screen into the Enter Measured Value
field. Note that the Product only accepts values in base units.
5. Continue to follow the instructions on screen for OPERATE/Measure/Input Value and/or switching
to the high current output via OUTPUT LO/SENSE 30 terminals until all steps in the function are
complete.
6. When a section is complete, the Product highlights the following section.
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for the
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