Hameg Instruments HM 8030-5 Manual De Instrucciones página 16

The frequency change is linear as a function
of the voltage U and has the same value in all
ranges.
DC offset
When the switch (9) ON is depressed, a DC
voltage can be superimposed on the output signal.
The maximum offset voltage with open output is
+ 5V.
Operational check
Measuring equipment required
20MHz Oscilloscope: HM303 or similar
HZ22 50Ω Through-Termination
HM8011-3 Digital Multimeter or similar
Adjustable DC voltage source
(max. 30V) e.g. HM-8040
HM8021-3 Frequency Counter
Frequency variation
The adjustment range of the VARIABLE knob (3)
must in any case overlap the selected decade on
both sides by min. 5%.
Amplitude stability
Setting; (6)
Connect oscilloscope to output (10). Use a 50Ω
throughtermination. Set oscilloscope to DC
coupling. Adjust signal height to 6div. Check all
frequency ranges with (4) and (3). The signal height
should not vary by more than 0.2 Div.
Maximum output amplitude
Setting: (6) (4)
1k
Connect oscilloscope to output (10). The signal
amplitude should be 20Vpp+500mVpp, With a 50Ω
load at the output (10), the signal amplitude should
still be 10Vpp ± 250mVpp
Output attenuator function
Setting: (6) (4)
~
100
Connect digital multimeter (VAC) to Output (10).
Set knob (12) for 5V display. Firstly depress one
button (11)(-20dB) only, then both buttons (11)
(40dB) simultaneously. The DVM should display
0.5V or 0.05V ±2% respectively.
Adjustment range of the offset voltage
Setting; (6)
Connect Oscilloscope to the output (10). Use a
50Ω through-termination. The DC potential should
vary between about + 2.5 V and - 2.5 V by use of
Sous réserve de modifications / Reservado el derecho de modificación
(4) (3) (12)
1k max max
(3) (12) (11)
max max relesed
(3) (12) (11)
50Hz max relesed
(4) (3) (12)
10k max max
control (8).
Frequency variation by FM input
Setting: (2) released (sweep off).
Apply an adjustable DC voltage (± 30V max.) to
the FM input. Display indication (1) will vary as a
function of the applied DC voltage. The obtained
results can be examined by use of the formulas
specified in the "FM input" section of the
operating instructions.
Trigger signal waveform
Connect the oscilloscope to output (10). A square
wave signal with TTL level and a 50% duty factor
will be shown on the screen ("Low": about 0.4V;
"High": about 5V).
Alignment procedure HM8030-5
The calibration of the HM8030-5 is performed
by means of a built-in calibration program.
Alignment is carried out by passing through the 9
consecutive steps of the calibration program. To
procede please use the > (4) key,the previous pro-
gram is reached by using the < (4) key.
The actual step is shown at the least significant
digit (blinking) of the frequency display (1), except
at step 4. This program uses the entire display (4
digit) to indicate the alignment result.
Measuring equipment required
60MHz Oscilloscope (e.g. HM604)
Frequency Counter (e.g. HM8021-3)
Digital Multimeter (e.g. HM8011-3)
Distortion Meter (e.g. HM8027)
Through-terminator 50Ω (e.g. HZ22)
Functions of the calibration program
Step 1: Amplitude and offset voltage of
triangle signal.
17