Operational Check - Hameg HM8037 Manual

quality coaxial cables should be used, e.g.
HZ34. It should be noted that the used
terminating resistor must dissipate the
corresponding effective power.
Synchronous output
The synchronous output (6) of the HM8037
module delivers a sine-wave signal with a
constant amplitude of about 2V
phase with the output signal (7). Any change
of the amplitude control or output signal
attenuator settings will not influence the
synchronous output voltage. The output is
short-circuit-proof. It has an impedance of
approx. 1kΩ and the same ground reference
as output (7). The synchronous output signal
is excellently suited for triggering oscilloscopes
or driving further measuring equipment. This
is especially favourable, when using signals
with particularly low amplitude supplied by
output (7).
Floating Operation
The HM8037 module output is isolated against
the chassis (protective earth) when pushbutton
(5) is pressed; i.e. the signal return line (low
potential) is not connected to the chassis
ground. Hum and noise voltages introduced
via the chassis are suppressed due to this
configuration. If (5) is released the mainframe
serves to connect the module to protective
earth.
Warning!
The maximum voltage (common mode
signal) between the isolated low poten-
tial line and the chassis (protective earth)
should not exceed 42V. Any higher
voltage will destroy the output amplifier
and be hazardous to the operator.
Sous réserve de modifications / Reservado el derecho de modificatión
External offset
Do not apply any DC voltage to the out-
put sockets of the HM8037 Module!
, which is in
pp
Distortion factor versus frequency
If the output of the HM8037 module comes
into contact with components of the circuit
under test, which are carrying DC voltage (i.e.
if the load resistor is superposed with a DC
voltage), an isolating capacitor of appropriate
dielectric strength should be connected in
series with the output line of the generator.
The capacitance of this isolating capacitor
should be selected in such a way that the
frequency response of the output signal is not
affected over the whole frequency range of
the HM 8037 unit.

OPERATIONAL CHECK

General
This test will permit you to check the functions
of the HM8037 unit at certain time intervals
without using any special test equipment. To
obtain the normal operating temperature, the
mainframe with inserted module should be
turned on at least 60 minutes before starting
the test.
Measuring equipment required
HM303 Oscilloscope
HM8021 Frequency Counter
HM8027 Distortion Meter
HM8011 Digital Multimeter
Resistor 600Ω, Coaxial Cable HZ34
UPM550 Level Meter (Sennheiser) or equiv.
If no Sennheiser UPM550 or any similar level
meter is available for the operational check,
the corresponding tests can also be carried out
21