
M800-00
T807/808 Initial Set-up & Adjustment
B4.3
Copyright TEL
31/08/96
4.1
Introduction
Warning:
The T807/808 contains voltages that may be lethal and extreme care
must be taken when working on a "powered up" supply.
Caution:
During set-up and adjustment it is essential that the T807/808 is con-
nected to the mains supply via an isolating transformer. For additional
protection the test set-up should be powered via an earth leakage cir-
cuit breaker.
Caution:
Connecting test equipment earths to a T807/808 which is not supplied
via an isolating transformer will connect the mains supply directly
across R3 & D1 and result in the destruction of R3.
Caution:
While the oscilloscope earth is connected to the DC primary negative
rail (TP4), the T807/808 is no longer isolated from the mains earth and
neutral. Extreme care is necessary when working on the power supply.
Disconnect the oscilloscope immediately after use.
4.2
Test Equipment Required
*Required for Fault Finding only (Section 6).
Item
Capability
Earth leakage circuit breaker
10A min., 115 or 230V, trip current <30mA.
Mains isolating transformer
1kVA min.
Variac
1kVA min., 0-260V AC (0-130V AC).
AC current meter
true RMS readings, range to 10A FSD.
AC voltmeter
ranges to 300V FSD.
DC current meter
0-30A FSD.
Variable DC load
0-100 ohm, 20A, 250W for T807
0-100 ohm, 30A, 400W for T808
*DC power supply
0-18V, 1A
*DC power supply
0-15V, 1A
Oscilloscope
20MHz, general purpose, good quality
*Oscilloscope probes
capable of handling 500V signals
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com