1. Electronics: Principles and Applications Eighth Edition
(Instrumentation Labs)
Charles A. Schuler
Lab 1
Introduction to the
Function Generator and DMM
McGraw-Hill
©2013 by The McGraw-Hill Companies, Inc. All rights reserved

2. A generator provides its calibrated output voltage when RL = RI.
VRMS RL RI
20 VPP
10 VPP
RI = 50 
VRMS =
0.707
VPP 2
= V
For a sine wave:

3. The open-circuit (unloaded) voltage is higher.
The DMM’s resistance (RM) is very high
and the generator is essentially unloaded.
RM = 10 M
20 VPP
20 VPP
(7.07 VRMS)

4. Measuring the dc voltage drop across RBRA RC
VOLTMETERS ARE CONNECTED IN PARALLEL.

5. This DMM has auto polarity.RB RA RC

6. Measuring the current through RC3
3. Select DC I 1
1. Use I jack 2
2. Press Shift RA
4. Break the
circuit RC RB
AMMETERS ARE CONNECTED IN SERIES.

7. W Measuring resistance RA RC RC RB
DO NOT MEASURE RESISTANCE IN LIVE CIRCUITS!

8. Function generator and DMM Quiz
A calibrated signal generator will produce an output equal to its
amplitude setting only when
the load is equal to RI
The open-circuit output amplitude is always ___________
than the amplitude setting.
greater than
Voltmeters are connected in
parallel
Ammeters are connected in
series
Ohmmeters are never connected to
live circuits