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Specifications
1780R-Series Service Manual
1–5
Table 1–2: Waveform Monitor Vertical System
Characteristic Performance Requirement Supplemental Information
Performance
Check Step
Return Loss
CH A, B1
,
B2, or B3 >40 dB DC to 5 MHz. (Terminated in 75 W.) 58
Aux Video In, Aux Video Out, & Pix
Mon Out
>34 dB DC to 5 MHz. Instrument On only. 58
Ext. Sync Input >46 dB to 5 MHz. 58
Loop-Through Isolation >80 dB at F
SC
, between channels
and each channel and EXT REF.
Measured externally.
Crosstalk Typically 70 dB isolation between
channels. Measured at F
SC
between channels and each
channel and EXT REF .
Frequency Response
Flat (X1)
50 kHz – 5 MHz ±1%. All inputs, 1 V Full Scale, Var.
Gain off. Adjusted for min. lum/
chroma gain error. Typically
<0.5%.
11–15
±2%. Aux In, and Aux Out. 15–16
5 MHz – 10 MHz ±1%. CH A, 1 V Full Scale, Var. Gain
off.
11
±2%. Ch B1, Ch B2, Ch B3, Aux In, and
Aux Out.
12–16
10 MHz – 15 MHz +2% –5%. All Inputs, 1 V Full Scale, Var.
Gain off.
11–15
15 MHz – 20 MHz +2% –15%. All Inputs, 1 V Full Scale, Var.
Gain off. –3 dB at >20 MHz.
11–15
Lum/Chroma Gain ±0.5%. X5 Gain with Modulated Sin
2
Pulse (12.5T NTSC, 10T PAL).
19
Voltage Cursor
Accuracy ±0.2%. 6
Resolution 1 mV.
Cal Amplitude
Accuracy 1.00 V ±0.2%. NTSC = 0.714 V ±0.5%.
PAL = 0.700 V ±0.5%.
3
Resolution 1 mV at 1.00 V.