Tektronix P6042 PROBE, Instruction Manual

Page: 23 / 72

Type P6042
SECTION 5
PERFORMANCE CHECK
Change information, if any, affecting this section is found at the rear of the manual.
General Information
This section of the manual provides a means of checking
the performance of the Type P6042 Current Probe. It is
intended to check the calibration of the instrument without
the need for performing the complete calibration procedure.
Failure to meet the requirements given in this procedure
indicates the need for internal checks or adjustments. The
user should refer to the Calibration section of this manual.
Performance of the P6042 should be checked after each
1000 hours of operation and at least once every six months
to assure that the instrument is operating correctly and
accurately.
The step by step instructions of the procedure furnish an
orderly approach to the isolation of possible malfunctions,
and thus serve as an aid in troubleshooting and repairing
the probe. Any maintenance that is known to be needed
should be performed before starting the procedure. If any
trouble becomes apparent during the performance check,
this should also be corrected and the procedure started
over. Repair and servicing information is given in the Main­
tenance section of this manual.
Equipment Required
The following (or equivalent) items of equipment are re­
quired to check the performance of the P6042 Current Probe.
If substitute equipment is used, it must equal or exceed the
given requirements in order to check the P6042 to the given
accuracy.
1. Storage oscilloscope, Tektronix Type 549 with Tektronix
Type 1A7 vertical plug-in unit. Minimum alernate require­
ments: Sweep rates from 50 ms/cm to 50 µs/cm; single­
sweep display; vertical deflection factors from 500 µV/cm to
0.5V/cm; vertical bandwidth selectable: DC
to 500 kHz, and
0.1 Hz to 100 Hz; 5 mA calibrated current loop.
2. High-frequency test oscilloscope, Tektronix Type 647A
with Type 10A2A and 11B2A plug-in units. Minimum alter­
nate requirement: Vertical deflection factors from 2V/cm to
20 mV/cm; sweep rates from 1 ms/cm to .02 µs/cm(with
X10 magnifier). Vertical bandwidth of DC to 100 MHz. A
single vertical input channel is used.
3. Square-wave generator, Tektronix Type 106. Minimum
requirements: Output amplitude of 10 V into 50 Ω, 200 mA;
output
repetition rate of 1 kHz.
4. Constant amplitude signal generator, Tektronix Type
191. Minimum requirements: Output amplitude of 5 V into
50 Ω, 100 mA; variable frequency to 50 MHz.
5. Pulse generator, Tektronix Type 109. Minimum require­
ments: Risetime of 0.25 ns; adjustable amplitude; 50 Ω output.
6. Delay Cable, Tektronix Type 113. Requirements: 60 ns
delay; characteristic impedance of 50 Ω.
7. 1x probe with BNC connector, P6011, Tektronix Part
No. 010-0193-00.
8. GR 50 Ω terminating current loop, Tektronix Part No.
067-0559-00.
9. Two GR 50 Ω 10X attenuators, Tektronix Part No.
017-0078-00.
10. GR-to-BNC adapter, Tektronix Part No. 017-0063-00.
11. Two 5 ns lengths of RG-8A/U with GR connectors, Tek­
tronix Part No. 017-0502-00.
12. Rectangular viewer, for use with the Type 647A test
oscilloscope, Tektronix Part No. 016-0039-00.
13. Resistor, 10 Ω,
±10%, 1/4 W, Tektronix Part No. 316-
0100-00.
NOTE
The high-frequency performance checks for the
P6042 Current Probe should be made with a DC
to 100 MHz test oscilloscope. Using a lower band­
width oscilloscope may result in an overall system
bandwidth lower than 50 MHz. Using a higher
bandwidth oscilloscope may cause aberrations in
excess of the specified 3%.
PRELIMINARY PROCEDURE
1. Set the Voltage and Range Selector switches on the
rear of the P6042 to the appropriate positions to match the
line voltage being used. (Refer to the Operating Instructions
section of this manual.)
2. Connect the P6042 to the power source and turn the
POWER switch ON. Allow five minutes warmup time at
25° C.
3. Place the selectable bandwidth plug-in unit in the stor­
age oscilloscope. Connect the IX probe to the +Input
connector. Connect a ground lead to the probe.
4. Preset the controls as follows:
Storage Oscilloscope
Enhance Mode
Off
Upper Screen Storage
Off
Lower Screen Storage
Off
Screen Selector
Full
Auto Erase
Off
Horizontal Display A
Mag
Off
Norm-Single Sweep Norm
A Time/cm 50 mS
5-1