HP 3478A Technical Manual page 22

3478A 3478A
The 3478A HP-IB Address is displayed when the The 3478A HP-IB Address is displayed when the
Address key is pressed. Address key is pressed.
The Local key returns the 3478A to front panel The Local key returns the 3478A to front panel
control from the REMOTE mode. control from the REMOTE mode.
The 3478A features total electronic calibration. The The 3478A features total electronic calibration. The
Cal key is used as part of that procedure See Section IV. Cal key is used as part of that procedure See Section IV.
9 9 The range The range keys keys are
range for the measurement. Press any of the keys to range for the measurement. Press any of the keys to
select the manual range mode. Note the M RNG select the manual range mode. Note the M RNG
annunciator in the display The annunciator in the display The Auto/Man
the meter to autorange. the meter to autorange.
10 (The "S 10 (The "SHIFTED HIFTED" funct " functions o
used to select alternate numbers of display digits used to select alternate numbers of display digits
characters to the left show the reading (e.g. + 12.3657 characters to the left show the reading (e.g. + 12.3657
MVDC). An "OVLD" is displayed if the input is out of MVDC). An "OVLD" is displayed if the input is out of
range for the selected range and function. range for the selected range and function.
3-12. 3-12. Input Terminals Input Terminals
3-13. 3-13. The 3478A The 3478A has has one
the front panel and one set on the rear panel. The front the front panel and one set on the rear panel. The front
panel terminals consist of an "INPUT HI", panel terminals consist of an "INPUT HI",
" " SENSE HI", SENSE HI", SENSE LO", and "A" (Amps) terminal. SENSE LO", and "A" (Amps) terminal.
Ω Ω Ω Ω
Except for the "A" terminal, the rear panel has the same Except for the "A" terminal, the rear panel has the same
set of terminals. The two sets of terminals are selected set of terminals. The two sets of terminals are selected
by the Front/Rear Switch (located on the front panel). by the Front/Rear Switch (located on the front panel).
The front terminals are selected with the switch "out" and The front terminals are selected with the
the rear with the switch "in". the rear with the switch "in".
3-14. 3-14. The INPUT The INPUT HI HI and and LO Terminals
measuring dc volts, ac volts, and resistance in the 2- measuring dc volts, ac volts, and resistance in the 2-
Wire Ohms configuration. Refer to Figure 3-2 Wire Ohms configuration. Refer to
typical connection. The typical connection. The
Ω Ω
Terminals (in conjunction with the INPUT Terminals) are Terminals (in conjunction with the INPUT Terminals) are
used in the 4-Wire Ohms configuration. Refer to Figure used in the 4-Wire Ohms configuration. Refer to Figure
34 for a typical ohms connection. The A (Amps) Terminal 34 for a typical ohms connection. The A (Amps) T
with the INPUT LO Terminal is used to measure ac or dc with the INPUT LO Terminal is used to measure ac or dc
current. Refer to Figure 3-3 current. Refer to Figure 3-3 for a typical current
connection. connection.
Figure 3-2. Typical Input Measurement Connection Figure 3-2. Typical Input Measurement Connection
are used used to to select select the the proper proper
Auto/Man key will return key will return
ions of the ra f the range key nge keys are
Figure 3-1. 3478A Front and Rear Figure 3-1. 3478A Front and Rear Panel Features (
one set set of of Input Input Terminals on Terminals on
"INPUT LO", "INPUT LO",
Ω Ω
switch "out" and
LO Terminals are are used used for
Figure 3-2 for a for a
SENSE HI and SENSE HI and SENSE LO SENSE LO
Ω Ω
erminal
for a typical current
11 (The Re 11 (The Rear In
Volts, AC Volts, and Ohms Functions. They are selected Volts, AC Volts, and Ohms Functions. They are selected
with the Front/Rear Switch in the "in" position. with the Front/Rear Switch in the "in" position.
12 The Exte 12 The External Tri
trigger the 3478A, when in the Single Trigger mode. trigger the 3478A, when in the Single Trigger mode.
13 13 (HP-IB Connector. (HP-IB
14 (The V 14 (The Voltmet
after each measurement cycle. after each measurement cycle.
15 The F 15 The Fuse i
operation, or 125mA for the 220V and 240V operation. operation, or 125mA for the 220V and 240V operation.
16 The Opt 16 The Option La
option. option.
s are
17 17 This This switch
the Power-On SRQ feature, and correct power line the Power-On SRQ feature, and correct power line
frequency (50Hz-60Hz). frequency (50Hz-60Hz).
Panel Features ( C ont'd)
Figure 3-3.Typical Current Measurement Connection Figure 3-3.Typical Current Measurement Connection
3-15. 3-15. Input Input Terminals
3-16. 3-16. The The high
that the area surrounding the multimeter's Input that the area surrounding the multimeter's Input
Terminals (front or rear) must be free of leakage causing Terminals (front or rear) must be free of leakage causing
for
paths (e.g. dirt, fingerprints, etc.). The paths can be paths (e.g. dirt, fingerprints, etc.). The paths can be
removed by using a soft cotton swab dipped in isopropyl removed by using a soft cotton swab dipped in isopropyl
alcohol. alcohol.
3-17. 3-17. FRONT FRONT PANEL
3-18. 3-18. DC DC Volts
3-19. 3-19. The The
measurements from .1uV to 300V in five ranges: 30mV, measurements from .1uV to 300V in five ranges: 30mV,
300mV, 3V, 30V, and 300V. All ranges are protected 300mV, 3V, 30V, and 300V. All ranges are protected
from input voltages up to 450V peak. Select the DCV from input voltages up to 450V peak. Select the DCV
Function for dc volts measurements by pressing the =v Function for dc volts measurements by pressing the =v
button. button. 3-20. 3-20. In the DC Vo
in the Input Circuitry of the 3478A. The result is that the in the Input Circuitry of the 3478A. The result is that the
input to the A/D Converter (which changes the input to the A/D Converter (which changes the voltage to
digital information) has the same value in all ranges for digital information) has the same value in all ranges for
3-3 3-3
TM 11-6625-3071-14 TM 11-6625-3071-14
ar Input Ter put Terminal minals are on s are only use
rnal Trigger co gger connect nnector is used t or is used to exter
Connector.
oltmeter Comp er Complete C lete Connec onnector ou
use is 25 s 25OmA for OmA for the 1 the 100V a
ion Label sho bel shows th ws the instru e instrument'
switch selects selects the the 3478A's 3478A's HP-IB
Cont'd)
Terminals Cleaning Cleaning
high input input impedance impedance of of the
PANEL OPERATION OPERATION
Volts Measurements Measurements
3478A 3478A is is able able to to
In the DC Volts Function, r lts Function, ranging is done
ly used in the d in the DC DC
o externally nally
tor output tputs a pulse s a pulse
00V and 12 nd 120V 0V
ment's powe s power r
HP-IB Address, Address,
the 3478A 3478A requires requires
make make dc dc volts volts
anging is done
voltage to