Tektronix 1720 User Manual

Checks and Adjustments
5–6
1720/1721
Performance Check Procedure
1. Preliminary Setup
a. Connect the variable autotransformer to the AC power connector. Turn
Power On and set the autotransformer for the voltage shown by the
rear-panel Line Voltage Selector switch.
b. Connect a composite color bar signal with 100% Peak White Bar and
75% amplitude color bars through the CH-B INPUT and terminate the
opposite side of the loop-through with a 75Ω terminator.
c. Turn on the 1720/1721 and set the controls as follows:
INTENSITY As desired.
FOCUS As desired.
SCALE As desired.
MODE VECT
REF INT
INPUT CH-B
VARIABLE Off
BARS 75%
AUXILIARY Off
2. Check Power Supply Operation
REQUIREMENT – Stable operation over an ac input range of 90 - 250 V.
a. Turn on the 1720/1721 and adjust the controls for a useable display.
b. Vary the autotransformer from low-line to high-line voltage (90 - 132 V
for 110 V, or 180 - 250 V for 220 V operation).
c. CHECK – for stable operation over the voltage range.
3. Check Synchronization
REQUIREMENT – Stable display with composite video or black burst
with 40 IRE (300 mV PAL and PAL-M) sync ±6 dB.
a. Disconnect the color bar signal and loop-through connect the black burst
output from the 1410 (1411 or 1412) SPG2 Mod AA as shown in
Figure 5-2.

Tektronix 1720 Specifications

General

Brand	Tektronix
Model	1720
Category	Measuring Instruments
Language	English