The Use and Calibration of the Kern ME5000 Mekometer - SLAC ...

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ME5000 Results
Tme from power on (hmm)
04 4
460 466 470 475 480 485 450 4% Sal SC5 510
Froquoncy (MHz)
FIGURE 2. Change of characteristic curve with time
TABLE 2. Change of modulator bandwidth with time: instrument 357089 (SL4C)
1 Time 1
h:mm
OiKl
0:20
1:OO‘
t 2:oo
Normal Range (MHz) I Extended Range (MHz) I
1.2. Modulator Bandwidth
The oominal bandwidths are 15 MHz for normal and 30 MHz for extended modes. Measurements
show that the normal bandwidth is always either 14.130 or 14.803 (the difference between these two
values is the spacing between measurements during the modulator calibration in which the bandwidth is
determined). The extended bandwidth, by contrast, varies considerably between instruments, Table 3.
TABLE 3. Modulator Bandwidths
1rLstmment Nonnal Range (MHz) Extended Range (MHz)
Lob s/n Date Lower Upper Range Lower Upper Raqe
LBL 357037 01-06-92 472.112 486.915 14.803 465.383 494.644 28.261
Fennilab 357046 01-13-92 476.149 490.952 14.803 474.130 492.971 18.841
CEBAF 357036 01-27-92 476.822 490.952 14.130 473.458 494.317 20.859
Argonne 357086 02-18-92 474.130 488.934 14.804 468.747 494.317 25.570
Brookhaven 357088 03-1692 476.149 490.280 14.131 472.785 493.644 20.859
SLAC 357089 06-10-92 472.112 486.242 14.130 464.710 493.644 28.934
ssc 357075 08-03-92 473.458 487.588 14.130 470.766 490.280 19.513
ssc 357081 08-06-92 472.785 486.915 14.130 469.420 490.280 20.859
1.3. Scale Factor
The frequency of each instrument is measured by Kern (L&a) in Switzerland prior to shipping, and
tbe result is shipped with the instrument in the form of a calibration certificate. This calibration consists
of a single measurement at c. 480 MHz. At SLAC a more comprehensive set of frequency measurements
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