Tektronix 2221A, User Manual

Page: 117 / 170

Appendix B: Specification
Table A-4: Electrical Characteristics {Cont.)
Characteristics
Performance Requirements
TV LINE
Internal
0.35 div1
External
35 mV p-p1
TV FIELD
> 1 division of composite sync1
EXT INPUT
a
Maximum Input Voltage
400 V (DC + peak AC) or 800 VAC p-p at 10 kHz or less.1
See Figure A-1 on page A-21 for maximum input voltage ver­
sus frequency derating curve.
Input Resistance 1 MQ ± 2%'
Input Capacitance
20 pF ± 2.5 pF1
AC Coupled Lower Cutoff Frequency
10 Hz or less at ~3 dB1
LEVEL Control Range
Trigger (NORM)
INT
May be set at any voltage level of the trace that can be dis­
played.1
EXT, DC At least ± 1.6 V, 3.2 V p-p.
EXT, DC - - 1 0 At least ± 16 V, 32 V p-p.1
VAR HOLDOFF Control4 (NON-STORE Hoi­
doff)
Increases sweep hoidoff time by at least a factor of 10.
Trigger Level Readout Accuracy
+ 15° C to 4- 35° C
±(0.3 division, +5% of reading)
Applies to ± 10 divisions from zero volts.
Acquisition Window Trigger Points
Pretrigger
Seven-eighths of the waveform acquisition window is prior to
the trigger (other trigger points are selectable via the MENU).
Performance requirement not checked in manual,
4Holdoff in STORE mode is a function of microprocessor activity and the pretrigger acquisition. The VAR HOLDOFF control main­
tains some control over the STORE hoidoff by preventing a new trigger from being accepted by the storage circuitry until the next
(or current, if one is in progress) NON-STORE hoidoff has completed.
2221A User Manual A-13