Sawtooth Output; Operational Check; General - Hameg Instruments HM8030-6 Manuel

Functions
frequency in the entire frequency range of the
HM 8030-6. The stop frequency can be
independently set the same way to a frequency
which is a maximum of 2 decades appart from
the start frequency. Push the SWEEP push button
again (STOP-LED lights). The max. freqency
deviation is given by the difference between start
and stop freqencies. This relationship may reach
a factor 100. The sweep time can be set when
TIME is selected by means of the SWEEP button
(TIME-LED lights). The sweep starts immediately
when TIME is selected and can be set during
operation. Time is set by means of the FRE-
QUENCY potentiometer
to 15s. For external frequency modulation please
refer to "FM input".
nd nd
nd nd nd
2 2 2 2 2 FM input FM input FM input
FM input FM input
If an AC voltage is applied to the FM input on the
rear panel of the HM8001-2, the generator
frequency is being frequency modulated in time
and according to the signal shape of this AC
voltage. The frequency deviation depends on the
amplitude of the AC voltage.
If a positive DC voltage is applied to the FM input
on the rear panel of the HM8001-2, the generator
frequency increases and is accordingly displayed.
A negative DC voltage reduces the frequency. The
frequency displacement depends on the value
and polarity of the DC voltage U and on the
FREQUENCY settings. The frequency delivered at
0V input may be freely selected.
Computation:
N = N N = N N = N N = N N = N + A × U or U = (N-N + A × U + A × U + A × U + A × U
0 0 0 0 0
N N N N N
= digit display at 0V
0 0 0 0 0
N N N N N = digit display applied voltage U, U, U, U, U,
U U U U U = ± voltage at the FM input.
A A A A A = approx. 1050 (digits per volt),
It should be noted that only the displayed digits
are valid; the decimal point is not taken into
consideration (e.g. 100.0 v 1000 digit). The max.
frequency (10 MHz) cannot and "000" should not
be exceeded. Any zeros preceding the decimal
point are dropped. The stability of the frequency
set depends essentially on the stability of the
applied voltage U.
The frequency change is linear a function of the
voltage U.
In 10 MHz range factor A is approx.
2500!
22
Subject to change without notice
and ranges from 20ms
U = (N-N U = (N-N U = (N-N U = (N-N ) : A ) : A ) : A ) : A ) : A
0 0 0 0 0
Examples:
N = 500 (Hz) (range 5k) , U = +2V:
0
N = 500 + 1050 · 2 = 2600
N = 3000 (kHz) (range 10M), U = -2V:
0
N = 3000 + 1050 · (-2) = 900
N = 50.0 (Hz) (range 500), N = 190.0 (Hz):
0
U = (1900 – 500) : 1050 = 1,33V

Sawtooth output

For correct triggering during sweep the HM8030-
6 features a sawtooth ouptput. This signal is
available at the rear panel of HM8001-2.

Operational check

General

This test should help verify, at certain intervals,
the functions of HM8030-6. In order to reach
thermal balance, the module and the basic
instrument, in its case, must be energized for at
least 60 minutes before the test begins.
Measuring equipment required
20MHz Oscilloscope: HM303 or similar
HZ22 50Ω Through-Termination or equivalent
HM8012 Digital Multimeter or similar
HM8040 Adjustable DC voltage source
(max. 30V) or similar
HM8021 Frequency Counter or similar
Frequency variation
The adjustment range of the FREQUENCY knob
must in any case overlap the selected decade
on both sides by min. 2%.
Amplitude stability
Setting: (6)
Connect oscilloscope to output
through termination. Set oscilloscope to DC
coupling. Adjust signal height to 6 div. Check all
frequency ranges with
height should not vary by more than 0.2 div.
(4) (3) (12)
1k max max
. Use a 50Ω
and . . . . . The signal