9100A/9200A/9400
Maintenance and Performance Checks 3-15
Required
Equipment
Recommended equipment for calibration is listed in Table 3-1.
Instruments other than those listed may be used only if their
specifications equal or exceed the required minimal characteristics.
Also listed below are accessories required for calibration.
Initial Checks
Proper calibration depends on healthy functionality of the 9400. These
initial checks are performed with the cover removed so take extra
precautions not to touch components or metal parts inside the 9400.
Always turn the power off and remove the power cord from the rear
panel Mains receptacle, if you are not sure or feel safe with any part
you are about to touch.
Before you perform the adjustments, verify that the 9400 operates
within the following conditions:
1. Turn Power on and observe that the power light turns on and the
fan is rotating and blowing air. Air is normally circulated from the
inside of the box.
2. Identify C105. Using a DMM measure the voltage drop across this
capacitor. Measurement should verify 12 Vdc, ±5%
3. Lift the front panel high voltage protection latch and turn on the
high voltage. Note that the High Voltage light turns on.
4. Identify C38, C65, C84 and C110. Using a DMM measure the
voltage drop across these capacitors. Measurement should verify
218 Vdc, ±2%
5. Identify C37, C83, C63 and C109. Using a DMM measure the
voltage drop across these capacitors. Measurement should verify -
218 Vdc, ±2%
6. Close the covers and allow the 9400 to stabilize its operating
voltage conditions.
Calibration
Procedures
Use the following procedures to calibrate the Model 9400. The
following paragraphs show how to set up the instrument for calibration
and what the acceptable calibration limits are. Calibration must be
performed with the high voltage turned on. To turn the high voltage on,
lift the protective latch and flip the high voltage switch ON.
Gain Adjustment
Equipment: Waveform Generator, DMM, Load Resistance, 50
Ω
feedthrough terminator
Preparation (use the same procedure for channels 1 through 4):
1. Configure the DMM as follows: