Tektronix 2230

General Information—2230 Service
Table 1-1 (cont)
Characteristics
Performance Requirements
TRIGGERING SYSTEM
A Trigger Sensitivity
P-P AUTO and NORM
Internal
External
10 MHz 60 MHz 100 MHz
0.35 div 1.0 div 1.5 div
40 mV 120 mV 150 mV
External trigger signal from a 50 n source driving a 50 Q coaxial
cable terminated in 50 U at the input connector.
HP REJ Coupling Reduces trigger signal amplitude at high frequencies by about
20 dB with rolloff beginning at 40 kHz ± 15 kHz.
Should not trigger with a one-division peak-to-peak 250 kHz sig
nal when HF REJ is ON.
P-P AUTO Lowest Usable Frequency
20 Hz with 1 division internal or 100 mV external.8
TV LINE
Internal 0.35 div.8
External
35 mV p-p.8
TV FIELD
> 1 division of composite sync 8
B Trigger Sensitivity (Internal Only)
10 MHz 60 MHz 100 MHz
0.35 div 1.0 div 1.5 div
EXT INPUT
Maximum Input Voltage A \ 400 V (dc + peak ac) or 800 V ac p-p at 10 kHz or less.8
See Figure 1-1 for maximum input voltage vs frequency derating
curve.
Input Resistance 1 MfJ ±2%.8
Input Capacitance
20 pF ±2.5 pF.8
AC Coupled Lower Cutoff Frequency 10 Hz or less at -3 dB.8
LEVEL Control Range
A Trigger (NORM)
INT
May be set at any voltage level of the trace that can be displayed.8
EXT, DC At least + 1.6 V, 3.2 V p-p.
EXT, DC-MO
At least ± 16 V, 32 V p-p.8
B Trigger (Internal)
May be set at any point of the trace that can be displayed.8
VAR HOLDOFF Control
(NON STORE Holdoff)
Increases NON STORE A Sweep holdoff time by at least a factor
of 10.8
STORE holdoff is a function of microprocessor activity and the
pretrigger acquisition. The VAR HOLDOFF control maintains
some control over the STORE holdoff by preventing a new trigger
from being accepted by the storage circuitry until the next (or
current, if one is in progress) NON STORE holdoff has completed.
Acquisition Window Trigger Point
PRETRIG
Seven-eighths of the waveform acquisition window is prior to the
trigger (other trigger points are selectable via the MENU).
POST TRIG
One-eighth of the waveform acquisition window is prior to the
trigger (other trigger points are selectable via the MENU).
1-7
'Performance Requirement not checked in Service Manual.