Fluke 45 - Manual (Page 38)

Operating the Meter From the Front Panel
Selecting A Function Modifier
3
3-11
CAL
ENABLE
V 10A
100
mA
600V CAT I
1000V CAT I
FUSE F1
500 mA
F 250V
POWER
AUTO
2ND
MN MX RATE
dB REL
REF# LOCAL
THRESH ADDR BAUD
HOLD
LO HI COMP
A
A V FREQ
DUAL DISPLAY MULTIMETER 45
V
!
REF
FUSED
COM
MN MX
dB REL
HOLD
-Press to Toggle In and Out of Relative Modifier
-Press to Toggle In and Out of Decibels Modifier
-Press to Select Touch Hold Modifier;
-Press to Force New Reading;
-Press and Hold Down for
2 Seconds to Exit.
-Press to Select MN MX Modifier;
-Press to Toggle Between Minimum
and Maximun Reading;
-Press and Hold Down for 2
Seconds to Exit MN MX Modifier.
aam15f.eps
Figure 3-7. Function Modifier Selection Buttons
REL (Relative Readings) Modifier
When the relative modifier (REL) is selected, the reading on the primary display is
always the difference between the relative base and an input measurement. For example,
if the relative base is 15.000 V, and the present reading is 14.100 V, the display will show
-0.900.
W
Warning
To avoid electrical shock or damage to the meter, note that a
relative reading may not indicate the presence of dangerous
voltages at the input connectors or test leads.
Press
K to toggle in and out of the relative modifier. When the relative modifier is
selected: the last valid reading is stored as the relative base, the primary display zeroes
out, and "
K" is shown on the primary display. (The secondary display is unaffected.)
To edit the relative base, use the number editor as described in "Using the Number
Editor" later in Chapter 3).
Note
The relative modifier cannot be selected I the display shows "OL" or is
blank. (The display would be blank, for example, because of external
triggering or range changes.)
Selecting the relative modifier
K turns off autoranging and locks in the present range.
Make sure you are in the correct range before selecting the relative modifier. If you press
U or T after the relative modifier has been selected, you will automatically exit K.
When you are in REL, the relative base can be shown in the secondary display by
pressing
S and, while holding it down, pressing K. Now, whenever the relative