The Comtest V35H offers many features not
available on other testers of its kind. Although several times faster
than similar products, it uses less battery power. V35 (high speed)
and V28 (control signals) are separated on the face plate for easiness
of reading.
The Signal Strength circuitry
test the voltage level of the V35 data and clock siganals as well
as for the V28 control signals. The test levels for V35 are at
0.3/0.6/1 and 2 volt, for V28 at 2/3/4 and 6 volt.Terminations
and DC sources are at hand for both V35 and V28, the voltage source
for V35 is galvanic separated.
The Ground Potential Difference
test circuit is an important feature needed if different grounds
(wall outlets) are used. The “in line” GPD tests for differences
over 2 volts, the unassigued monitor/trap allows test of Ground
Potential Differences as low as 0.3 volt.
The breakout switches
together with the sockets on DCE/DTE side allow breaking and crosshatching
of all 34 lines by means of the switches and the jumper cables
supplied with the unit. The high impedance line monitors do not
load the circuit. The pulse trap shows short duration (20nS) changes
on the circuit not visible to the naked eye on the monitors.
The Comtest V35H runs
over 20 hours on one single 9 volt battery, it can also be powered
by a 9 volt -stabilised / 100mA- mains adapter (optionally).
