Sect. I1 Page 2
2) Set the RANGE and FREQUENCY controls for the must be connected to one of the OUTPUT terminals,
desired frequency. The frequency dial scale must and the strapped pair will then be the ground side of
be multiplied by the multiplying factor indicated by the output.
the RANGE switch setting to obtain the oscillator
frequency. Example: (on dial 4 scale) x .l (multi-
plying factor indicated by RANGE switch setting)
= .4 cycles/sec.
2-6 BALANCED OUTPUT
Connect the two OUTPUT binding posts to the equip-
3) Set the FUNCTION switch for the desired output ment being supplied. The "G" binding post may
waveform. then be connected to the chassis of the equipment
being driven. Under these conditions internal the
impedance of the Model 202A from either OUTPUT
4) Connect the equipment under test to the OUTPUT terminal to ground is 7900 ohms in series with a 1 pf
terminals. capacitor (C29). A maximum dc voltage of 400 volts
may be applied between either OUTPUT terminal
and the "G" terminal without damaging the 1 pf
5) Adjust the AMPLITUDE Control for the desired capacitor (C29). The 40 ohms internal impedance
output voltage. Because the frequency response (resistive) will shunt the impedance existing between
is rated k0.2 db, the output amplitude be may mea- the two signal inputs of the system being driven.
sured at any convenient frequency and the output Under circumstances where the connection places
level will be correct (within these limits) for any the Model 202A in series with a path carrying cur-
other frequency. rent, distortion of the Model 202A output will occur
if greater than 10 ma peak current is caused to flow
through the Model 202A output system.
NOTES
When small output voltages are required it be may
desirable to use an external attenuator. This is
because the hum and noise in the output is nearly
0
constant with output amplitude. @
EQUIPMENT
To minimize distortion in the output waveform,
always use the lowest RANGE when the overlap
SUPPLIED
of the FREQUENCY dial permits a choice.
-------------
ground or no
- signal point
2-5 SINGLE-ENDED OUTPUT
Figure 2-2. Balanced Output Connections
The terminal marked "(3" is isolated from the actual
OUTPVT terminals. For single-ended operation "(3'
2-7 SYNC. OUT
The SYNC. OUT is a negative pulse of less than
0 5 microseconds duration and at least 10 volts peak
EQUIPMENT into a 2,500 ohm load. It occurs on one of the sine
and triangular crests and at the rise orfall of the
BEING
SUPPLIED squarewave. It occurs at the positive crests with
respect to one of the OUTPUT terminals and at the
negative crest of the other. Therefore, it can be
changed by 180" with respect to the output system
- - by reversing connections the to two OUTPUT ter-
RO minals, which are otherwise completely interchange-
able. The SYNC. OUT terminal marked "G1' is
FYgwe 2-L Single-Ended Output Co~ections directly connected to the chassis. |
ACEC
HEWLETT-PACKARD
