Produced by. GMI Engineering & Management Institute. &. Agilent Technologies. AGILENT 34401A MULTIMETER. 6 1/2 digit, high performance digital. F. multimeter. AC/DC voltage measurements. F. AC/DC current measurements. F. 2 and 4 wire resistance measurements. F.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
6 1/2 digit, high performance digital
F
multimeter
AC/DC voltage measurements
F
AC/DC current measurements
F
2 and 4 wire resistance measurements
F
Frequency and Period measurements
F
Math functions
F
Agilent 34401A Multimeter
Avoid contact with Voltage or Current
Source.
1) Use shrouded test leads and alligator clips.
2) Connect leads to multimeter first.
3) Do all normal connect/disconnect at source.
4) Familiarize yourself with the manual.
Safety Tips
1) Inductive Devices (e.g. transformers, chokes/inductors)
induce very high transient voltages.
2) Measuring resistance: Avoid contacting probes with live
circuits when in resistance modes.
3) Measuring Current: Do not connect probes across voltage
source.
Safety Tips
To perform a complete selftest, hold down
F
the
shift
key for more than five seconds as
you turn on the multimeter.
The display will indicate whether test passed.
F
Error messages will be displayed if a failure
occurs.
Starting Multimeter
000.002 mVDC
in a topdown tree
structure with 3 levels
To turn on menu Shift
On/Off
To move left or right To move up or down To enter command
Auto /
Man
A: Meas Menu B: Math Menu C: Trig Menu D: Sys Menu E: I/O Menu F: Cal Menu
1: AC Filter 2:Continuity 1: Read Hold 1: HPIB ADDR
1: MinMax 1: RDGS Store 1: Secured
Menu at a Glance
To make null (relative) measurement
Null
Min
To store min/max readings
Max
To make dB measurements
Shift
dB
dB =
reading in dBm

relative value in dBm
Shift
dBm
To make dBm measurements
dBm = 10*Log
(
reading
/ reference resistance/ 1mW)
2
10
Limit testing
(Access through Menu)
Math Functions
: Continuously takes readings at fastest rate
possible for present configuration. Default.
Single trigger
: Manual trigger by pressing Single
One reading or specified number of readings (Sample
count).
Number of samples
: Number of readings meter takes with each
trigger: 1 to 50,000. Default is 1.
Reading hold
: Select by pressing Shift
Auto/Hold
Captures and holds a stable reading on the display.
Triggering
+
AC
1.000000 VDC
1 VDC

Measuring DC Voltage
* Note measurement indicates only DC portion of signal
Range
100 mV 1 V 10 V 100 V 1000 V
(750 VAC)
Maximum
m
m
m
100 nV 1 V 10 V 100 V 1 mV
Resolution
m
(750 VAC)
Integration Time
Integration Time
**
Resolution Choices
.02
PLC
Fast 4 Digit
.2
PLC
Fast 5 Digit
1
PLC
*
Slow 4 Digit
10
PLC
* Slow 5 Digit
* Fast 6 Digit
100
PLC
Slow 6 Digit
*
Equivalent to Pressing “Digits” key on front panel.
**In Power Line Cycles (PLC).
Integration times of .02 and .2 do not provide powerline noise rejection characteristics.
Fastest, Least Accurate
Default
Slowest, Most Accurate
DCV proportional to AC RMS
Coupling capacitor
blocks DC; only lets
AC signal through
A/D
AC to DC
AC amplifier/
converter
converter
attenuator
2 V pp
+
AC
1 VDC

Measuring AC Voltage
707.106 mVAC
* Note measurement indicates only the AC portion of signal
Range
*
Time to settle
3 Hz and above Slow 7 sec.
20 Hz and above Medium 1 sec.
200 Hz and above Fast 0.1 sec.
AC Filter
*Selectable through the measurement menu
ACCouplingAdvantage
*Removes DC Portion of Signal
ACCouplingDisadvantage
*Low Frequency waveforms can be cutoff
:
rms
RootMeanSquare
v(t)
2
P =
Instantaneous power to a resistor is:
F
R
Average power to a resistor is:
F
to+T
(
)
1
1
2
Vrms
2
Pavg =
=
v(t)
dt
R
T
R
to
Solving
for Vrms:
A given Vrms AC has the heating (power)
F
effect of a VDC with the same value.
to+T
1
2
*
Vrms
v
(
t
)
dt
T
to
(same for ac and dc)
D
V
I =
r
D
V
+
Iac+
R
Idc
–
Iac+
Idc
SHIFT
DC I
= Measure DCI
SHIFT
AC I
= Measure ACI
Break circuit to
*
NEVER HOOK CURRENT LEADS
measure I
DIRECTLY ACROSS A VOLTAGE SOURCE
Measuring Current
r
1.000000 ADC
+
R
X
–
W
1 k
W
* Press
W
2W
*
Resistance measured includes
*
To eliminate the lead resistance:
lead resistance
 Short leads together
 Press
NULL
 Lead resistance will be subtracted from reading
Measuring Resistance 2wire
W
1 k
W
* Turn off “Null”
* Press SHIFT
W
4W
*
No error due to lead resistance
Measuring Resistance 4wire
=0
I
D
V
test
i
=0
Low Input
D
V = I
* R
test
D
V
R =
I
test
4Wire Resistor Measurement
i
High Input
High Sense
i
High Z
R
Low Sense
i
i
& Diode Check
+
Open or
Closed

Circuit.
Cont
= Continuity test
Shift
=
Diode check
Forward Bias
Period
33.000,0 kHz
33 kHz
Freq = Measure Frequency
Shift
Period
= Measure Period
+
+
Signal
Reference
Voltage
Voltage
–
–
dc signal voltage
dc reference voltage
Ratio Measurements
Ratio =
*To enable ratio measurements, use the MEAS menu.
Voltage
RMS vs. Peak
Vrms
Vp
1.0
1.414
sine
1.0
1.733
triangle
1.0
1.0
square
1.0
1.0
DC
* Peak voltage = 1/2 of Peak to Peak voltage
High Z Termination
SIGNAL SOURCE
MEASURING DEVICE
i
W
Ro=50
Ri
Ci
Vm
Vs
i
*
1
Ri
Zc
Zin
Zc
2p
Ri +
Zc
j
f
C
Ro
*
@
=
. . . .
Vs
1 +
Vm
for very large Zin, Vs
Vm
Zin
As frequency increases, Zin decreases
For less than 1% error Zin
>
100 Ro
W
Ro=50
W
50
W
50
W
50
W
2
*
*
Vs
SIGNAL SOURCE
MEASURING DEVICE
i
Ri
Ci
Vs
Vm
i
i
High Resistance
*
Vs
1+
Vm
Vs
Vm
1
Vm
2
*Vm will not equal Vs, if Zin = Ro, but the ratio between them is 2:1.
Can be any value between 0  31. Factory set at 21.
Address 31 is talk only mode.
Adjustable only through the I/O menu.
RS232 Interface:
Baud rate must be selected (I/O menu): 300, 600, 1200,
2400, 4800, or 9600.
Parity selection (I/O menu): Even or Odd
Programming Languages
HPIB
RS232
SCPI Language
HP 3478A Language
Not allowed
Fluke 8840A Language
Not allowed
Remote Interface
meter
Vs = ideal DUT voltage
Rs = DUT source resistance
Ri = multimeter input resistance
(10 M
W
or > 10 G
W
)
100 * Rs
Error(%) =
Rs + Ri
Loading Errors (DC volts)
Rs
HI
Ri
Vs
LO
Ideal
HI
meter
Ri
Vs
Ci
Ib
LO
Ib = multimeter bias current
Rs = DUT source resistance
Ci = multimeter input capacitace
Error(v)
@
Ib
*
Rs
Leakage Current Errors
(CMR)
Ideal
meter
Ri > 10 G
W
Vf = float voltage
Rs = DUT source resistance
Vf * Rs
imbalance
Error(v) =
Rs +Ri
Ri = multimeter isolation
resistance
HI
Vtest
Rs
LO
Vf
Ideal
meter
HI
Vtest
Rl
LO
Ri > 10 G
W
Vground
Rl = lead resistance
Ri = multimeter isolation resistance
Vground = voltage drop on ground bus
Noise caused by Ground Loops
Hints for Accurate Measurements:
Measure as near full scale as possible
F
Use a Ratio measurement whenever
F
possible.
Before measuring, short the test leads
F
together to check for offsets.
(Exception: RMS AC measurements)
F
Agilent 34401A Service Guide
F
For online technical information call HP
F
Direct at 18008294444
Where to get more information