HP 4278A - Page 60

When the secondary parameter limits are set and the AUX BIN are set to on:
Secondary
Parameter
AUX BIN
Higher
Limit
OUT OF
BIN
OUT OF
BINS
Sorting
BINS
Lower
Limit
AUX BIN
Capacitors whose primary parameter is not within limits are sorted as OUT OF BINS. Ca-
pacitors whose primary parameter is within limits, but whose secondary parameter is out of
limits are sorted into the AUX BIN.
Lower Higher
Limit Limit
Figure 3-14. AUX BIN
3-10-4. BIN COUNTER
Primary
Parameter
The 4278A has bin counting capability, the number of capacitors sorted into each bin is
counted. The maximum count is 999999, and resets to zero when this value is exceeded.
When the 'RESET COUNT' softkey is pressed, all counts will be reset to zero.
3-11. CABLE LENGTH SELECTION
The 4278A has three planes of calibration -- at the UNKNOWN terminal (Om), to the end of
the HP 16048A/B test leads (1m), and to the end of the HP 16048D test leads (2m). Mea-
surement accuracy is specified at these three points. Select the cable length which cor-
responds to the length of cables you are using.
When you select Om, the four outer conductors of the HCUR, HPOT, LPOT, and Lcua leads must
be tied together at the UNKNOWN terminals. When you select lm, the four outer conduc-
tors of the HCUR, HPOT, LPOT, and LCUR leads must be tied together at the end of the 1m
leads. When you select 2m, the four outer conductors of the HCUR, HPOT, LPOT, and LCUR
leads must be tied together at the end of the 2m leads. In other words, the four-terminal
pair configuration must be terminated for the cable length selected. When an HP 16048A/B/
D test leads are used, use the furnished terminal plate at the end of the cable for easy
configuration.
NOTE
The maximum length of the test leads which can be used for 1 MHz measuremnts
is 2.5m.
3-21