LeCroy HFP1500, Instruction Manual

Page: 43 / 50

Adjustment Procedure
HFP1500-OM-E Rev E
8–5
Figure 8-3. Offset Range Adjustment setup.
7. Remove the banana plug adapter from the DMM connect the precision 50
Ω
termina-
tor into the DMM Input. Make sure the side of the banana plug corresponding to the
BNC shield (marked ’GROUND’) is connected to the
LO or COMMON input of the
DMM.
8. Verify that the display for channel 1 is turned on. Set the oscilloscope OFFSET knob
to –10.00 V. as read on the oscilloscope screen.
9. Set the DMM to read DC Volt on the most sensitive range.
10. Subtract 10.0 V from the power supply output voltage recorded in step B-7. Be sure to
keep track of the sign of the result.
11. Adjust OFFSET RANGE until the DMM reads the same voltage ±1 mV as calculated
in step B-11. Be sure the sign agrees.
12. Repeat steps A-3 through A-7 of the Adjust Offset Zero procedure.
13. Disconnect the probe from the ProBus extender and re-install the circuit board into the
probe case, being careful to align the ProBus interface connector with the opening on
the other end of the case.
HF
P
25
00
Power Supply
LeCroy Oscilloscope
Precision 50
Ω
Terminator
ProBus Extender Cable
HFP1500 Probe
DMM