9
Manual Ranging
Press AUTO to toggle in and out of manual ranging. The range you are in when you enter the manual
range mode becomes the selected range.
In manual range, the meter remains in the selected range regardless of input. Press AUTO to toggle
back to autoranging.
Press to up range. If the is pressed when the meter is still in autorange, manual ranging is
selected, the “AUTO” annunciator turns off, and the next higher range is selected (if there is one).
Press to down range. If the is pressed when the meter is still in autorange, manual ranging
is selected, the “AUTO” annunciator turns off, and the next lower range is selected (if there is one).
When one function of Volts DC, Amps DC, Volts AC, Amps AC, Resistance or FREQ is selected, the
selected range is displayed on the secondary display.
MEASURING FREQUENCY ( FREQ )
Press the FREQ button to select the frequency function, the frequency is displayed on the primary
display and the selected range is displayed on the secondary display. Select the rang manually or
automatically
Frequency Measurement Rates
The rate at which frequency measurements are taken is selected by the meter automatically, when the
frequency function has been selected, press RATE has no effect on the frequency update rate.
Frequency Sensitivity Selection
Before a frequency measurement is started, the amplitude of the input signal is sampled and the
optimum ac voltage range is selected automatically. For more information refer to the Section 6 for ac
voltage sensitivity.
The input signal sensitivity is based on sine waveforms. If the input signal is below the required level,
the frequency will be displayed as zero. If the measurements are unstable, the input signal may be near
the threshold level.
SELECT A FUNCTION MODIFIER ( REL , HOLD , MNMX , COMP )
Selec
ting a function modifier causes the meter to perform an
action on an input (e.g., convert to relative reading
mode or compare to another value) before a reading is
displayed. To use a function modifier, press a function
button to select a primary function, and then press a
function modifier button. See Figure 3-5
REL (Relative Readings) Modifier
Press REL to select the relative modifier. When the relative modifier is selected: the last valid reading
is stored as the relative base and displayed on the secondary display. The reading on the primary
display is always the difference between the relative base and an input measurement, and the “
△
”
annunciator turn on.
REL=present reading - relative base
For example, if the relative base is 15.000V, and the present reading is 14.100V, the
display will show -0.900V.
WARING
REMEMBER, A RELATIVE READING MAY NOT INDICATE THE PRESENCE OF DANGEROUS
VOLTAGES AT THE INPUT CONNECTORS OR TEST LEADS. USE CAUTION TO AVOID
ELECTRICAL SHOCK OR DAMAGE TO THE METER.
Press REL again, the relative base is displayed on the secondary display. The reading on the primary
display is REL%, and the “%” annunciator turn on simultaneous.
D C V
A C V
F R E Q
D C A
A C A
A U T O
M N
S H I F T
M X
H O L D
C O M P
O N
1
P O W E R
O F F
0
R A N G E
d B m
R E L
R A T E
读 数 速 率 键
R E L
C O M P
H O L D
M X
M N
R e la t iv e M o d if ie r
M N M X M o d if i e r
C o m p a r e M o d i f ie r
T o u c h H o ld M o d if i e r
F ig u r e 3 - 5 . F u n c t io n M o d if ie r S e le c t i o n B u t t o n s
REL%=
present reading-relative base
relative base
×
100%
