Tektronix 2445, Instruction Manual

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Specification—2445 Service
Table 1-1 (cont)
Characteristics
Performance Requirements
VERTICAL DEFLECTION SYSTEM -CHANNEL 1 AND CHANNEL 2 (cont)
Common-mode Rejection Ratio (CMRR)
A t least 20:1 at 50 MHz for common-mode signals of eight divisions
or less, w ith VAR VO LTS/D IV control adjusted fo r best CMRR at
50 kHz at any VO LTS/DIV switch setting from 5 mV to 5 V; at
least 20:1 at 20 MHz at 2 mV per division.
Channel Isolation
100:1 or greater attenuation o f the deselected channel at 100 MHz;
50:1 or greater attenuation at 150 MHz, fo r an eight-division input
signal from 2 mV per division to 500 mV per division, w ith equal
VO LTS/DIV switch settings on both channels.
Displayed Channel 2 Signal Delay w ith Respect
to Channel 1 Signal
Adjustable through a range o f at least —500 ps to +500 ps.
Input R and C (1 MH)
Resistance 1 M£2 ±0.5%.a
Capacitance 15 pF ±2 pF.a
Maximum Input Voltage ^ 400 V (dc + peak ac);
800 V p-p ac at 10 kHz or less.3
Input R (50 £2)
Resistance 50 f2 ±1%.a
VSWR (DC to 150 MHz) 1.3:1 or less 3
Maximum Input Voltage ^ 5 V rms; 0.5 W-seconds during any 1-s interval fo r instantaneous
voltage from 5 V to 50 V.
Cascaded Operation CH 2 SIGNAL OUT into Channel 1 input; DC coupled using a
50-£2 RG-58C/U coaxial cable, terminated in 50 f2 at the Channel 1
input. Channel 1 and Channel 2 VO LTS/DIV switch set to 2 mV.
Bandwidth Dc to 50 MHz or greater.
Deflection Factor 400 juV per division ±10%.
VERTICAL DEFLECTION SYSTEM -CHANNEL 3 AND CHANNEL 4
Deflection Factor
Values
0.1 V per division and 0.5 V per division.
Accuracy Within ±10%.
Frequency Response
Six-division reference signal, from a terminated 50-f2 system.
—3 dB Bandwidth
w ith standard accessory probe
—4.7 dB Bandwidth
w ith external 5G-i2 termination
DC to 150 MHz
DC to 150 MHz
Performance Requirement not checked in manual.
1-3