SSP - 4
Dark Counts

Introduction
The dark counts on the SSP- 4 appear to drift considerably. A test was set up to measure these and plot the results. The unit was turned on and allowed to stabilize for 30 minutes. The offset was adjusted for 500 dark counts with a Gain of X100 and Integration time of 1 seconds. After allowing a few more minutes for the unit to stabilize data acquisition began.

Data
Data was taken every second for about 5 minutes (300 seconds) The following table represents that data. The first number is time (seconds) and the following number is the dark count (counts per second). For example 01 478 is 01 second with a count of 478. This was done with a Gain of X100 and gate/integration time of 1 second.

---

01 478 02 475 03 478 04 477 05 478 06 479 07 474 08 466 09 463
10 460 11 459 12 461 13 459 14 460 15 475 16 475 17 461 18 458 19 457
20 456 21 454 22 453 23 451 24 453 25 459 26 461 27 462 28 459 29 459
30 458 31 459 32 458 33 458 34 454 35 453 36 470 37 459 38 452 39 453
40 451 41 449 42 450 43 449 44 447 45 446 46 436 47 429 48 435 49 434
50 428 51 424 52 423 53 422 54 424 55 431 56 432 57 429 58 429 59 427
60 427 61 427 62 425 63 425 64 422 65 421 66 418 67 418 68 419 69 421
70 419 71 427 72 430 73 432 74 429 75 430 76 428 77 429 78 426 79 426
80 425 81 426 82 410 83 409 84 406 85 405 86 404 87 404 88 405 89 404
90 407 91 404 92 401 93 399 94 395 95 399 96 386 97 389 98 386 99 385
100 380 101 382 102 381 103 368 104 381 105 384 106 370 107 361 108 365 109 371
110 369 111 368 112 377 113 377 114 376 115 376 116 376 117 377 118 373 119 364
120 364 121 369 122 369 123 372 124 370 125 370 126 370 127 365 128 370 129 363
130 364 131 365 132 366 133 364 134 364 135 362 136 364 137 362 138 360 139 359
140 364 141 359 142 357 143 354 144 356 145 353 146 356 147 354 148 339 149 340
150 340 151 340 152 351 153 351 154 349 155 350 156 351 157 349 158 355 159 355
160 355 161 355 162 356 163 353 164 351 165 352 166 352 167 353 168 353 169 355
170 351 171 350 172 349 173 347 174 354 175 354 176 354 177 355 178 355 179 356
180 351 181 356 182 357 183 356 184 355 185 354 186 353 187 354 188 354 189 356
190 350 191 348 192 340 193 347 194 347 195 348 196 346 197 345 198 345 199 345
200 344 201 344 202 344 203 344 204 343 205 346 206 342 207 343 208 341 209 342
210 337 211 327 212 341 213 342 214 342 215 342 216 342 217 334 218 328 219 329
220 329 221 327 222 326 223 328 224 327 225 324 226 323 227 325 228 326 229 326
230 329 231 336 232 334 233 334 234 333 235 335 236 334 237 347 238 342 239 331
240 333 241 333 242 329 243 328 244 324 245 325 246 326 247 323 248 324 249 324
250 321 251 328 252 331 253 333 254 333 255 333 256 333 257 338 258 343 259 343
260 342 261 342 262 342 263 343 264 329 265 326 266 324 267 326268 324 269 321
270 309 271 322 272 322 273 325 274 324 275 322 276 322 277 321 278 308 279 309
280 309 281 309 282 307 283 309 284 306 285 306 286 308 287 314 288 310 289 308
290 303 291 299 292 305 293 305 294 304

Data Table

---

Dark Count Plots

Present Page Version as of 21 November 2006

phxjeff@hposoft.com
www.hposoft.com