Atec Tektronix-1502 - Manual (Page 20)

TM 9-4935-601-14-3&P
9. Change mp/DIV to 50 and adjust the POSITION controls so the top of the incident pulse is on the
horizontal centerline.
10. Press the NOISE FILTER Pushbutton and check for a reduction in the displayed noise as well as a
reduction in the scan rate. Reset mp/DIV to 500, and release (by depressing a second time) the NOISE
FILTER button.
11. Lift up and hold the RECORD switch. Check that a bright spot appears at the left edge of the crt.
12. Release the RECORD switch. The slow scan of the spot will trace the displayed waveform. When the
scan is complete. The 1502 will automatically return to its normal mode of scanning.
CONNECTING A TEST CABLE TO THE 1502
CAUTION
Do not connect live circuit cables to the input of the 1502. Voltages in excess of 5 V can damage
the sampling gate or tunnel diode. If both the sampling bridge and tunnel diodes are destroyed at
the same time, an improper use is indicated. If such simultaneous damage occurs, repair
charges will be assessed to the customer regardless of the equipment warranty period.
Bleeding of cables before connecting them to the 1502 will remove static charge from them. The
50
Ω
termination and BNC adapter supplied may be used to bleed any cable charge.
When testing antennas, be sure that you are not close to transmitters that can be keyed at the
antennas receiving frequency. Keying of transmitters in close proximity can cause damage to the
1502.
Connect cables to be tested by the 1502 to the BNC connector (CABLE) on the front panel. Table
2-1 lists optional connectors/adapters that can be used with the 1502.
Table 2-1.
OPTIONAL CONNECTORS/ADAPTERS
FOR THE 1502
Type
Tektronix Part
Number
Terminator, 75
Ω
BNC 011-0102-00
Adapter, 50 to 125
Ω
017-0090-00
Adapter, 50 to 75
Ω
017-0091-00
Adapter, 50 to 93
Ω
017-0092-00
BNC Connector, Female to Clip Leads 013-0076-00
BNC Connector, Female to GR 017-0063-00
BNC Connector, Male to GR 017-0064-00
BNC Connector, Female to UHF Male 103-0015-00
BNC Connector, Male to UHF Female 103-0032-00
BNC Connector, Male to Dual Binding Post 103-0035-00
BNC Connector, Female to N Male 103-0045-00
BNC Connector, Male to N Female 103-0058-00
BNC Connector, Female to Dual Banana Jack 103-0090-00
BNC Connector, Male to Male 103-0029-00
LOCATING A DISCONTINUITY IN A CABLE
The DISTANCE dial and the FEET/DIV (METRES/DIV) control make it possible to evaluate cables as
long as 2000 feet (500 metres). The entire length can be displayed directly on the crt if desired. If a chart
recorder is used, only that portion of the trace seen on the crt will be recorded on the graph.
To check cables using only the crt display, the FEET/DIV (METRES/DIV) control and the X1/X.1 control
must be set so that the crt display window is longer than the cable. For example, if the cable is 150 feet (46 m)
long, set the FEET/DIV (METRES/DIV) to 200 (50) and the multiplier at X.1.
NOTE
Use the X.1 multiplier whenever possible to lessen the effects of jitter.
REV B FEB 1980
2-5